Parallel Arrays

[XML] [Smart Pascal] [JavaScript] [Python] [PHP] [Output]

This example of parallel arrays takes the top six finishers in the Premier League in 2017. There are four parallel arrays, such that for each index from 1 to 6 the club name, points, goals for and goals against correspond. The program outputs all of the details for the team(s) conceding the fewest goals. We used the Blockly Playground to generate the JavaScript, Python and PHP code from the same blocks.

The blocks

The blocks

XML Code of Blocks

<xml xmlns="http://www.w3.org/1999/xhtml">
  <block type="variables_set" id="ly;Oz.~v~h$h+SV%m)6^" x="-313" y="-387">
    <field name="VAR">strTeamNames</field>
    <value name="VALUE">
      <block type="text" id="gh]8?,)Ho=mq;dp}bub:">
        <field name="TEXT">Chelsea,Tottenham Hotspur,Manchester City,Liverpool,Arsenal,Manchester United</field>
      </block>
    </value>
    <next>
      <block type="variables_set" id="DIqXCA9|Gm}a[sOsOh`l">
        <field name="VAR">strTeamNamesArray</field>
        <value name="VALUE">
          <block type="lists_split" id="esVh3uy#X|%!mbJ!^_vc">
            <mutation mode="SPLIT"></mutation>
            <field name="MODE">SPLIT</field>
            <value name="INPUT">
              <block type="variables_get" id="!nfx!(pP}~Cw5A6_{rr:">
                <field name="VAR">strTeamNames</field>
              </block>
            </value>
            <value name="DELIM">
              <shadow type="text" id="Oh*x@TGIjJ7t`~kG[|2b">
                <field name="TEXT">,</field>
              </shadow>
            </value>
          </block>
        </value>
        <next>
          <block type="variables_set" id="_.i)`VZ8*0iSDfhE)jIb">
            <field name="VAR">intArrayPoints</field>
            <value name="VALUE">
              <block type="lists_create_with" id="B?-.Nk|bmD1oL`X{ot5,">
                <mutation items="6"></mutation>
                <value name="ADD0">
                  <block type="math_number" id="q.a1L^vQhGphvKF~]^S@">
                    <field name="NUM">93</field>
                  </block>
                </value>
                <value name="ADD1">
                  <block type="math_number" id="T7G!R{$n/p48z~`YpJrq">
                    <field name="NUM">86</field>
                  </block>
                </value>
                <value name="ADD2">
                  <block type="math_number" id="_RZF43o$b3wS37F{^DbV">
                    <field name="NUM">78</field>
                  </block>
                </value>
                <value name="ADD3">
                  <block type="math_number" id="nBT4OD_^y53[Cb$isKq`">
                    <field name="NUM">76</field>
                  </block>
                </value>
                <value name="ADD4">
                  <block type="math_number" id="Xr5[)WY._Hs8G-QFl9~x">
                    <field name="NUM">75</field>
                  </block>
                </value>
                <value name="ADD5">
                  <block type="math_number" id="QNl~+rd_Snw6?=6X6}@2">
                    <field name="NUM">69</field>
                  </block>
                </value>
              </block>
            </value>
            <next>
              <block type="variables_set" id="5J_8_Eh?=[D;WK-+[;kV">
                <field name="VAR">intArrayFor</field>
                <value name="VALUE">
                  <block type="lists_create_with" id="?h`{:SkwXZXV+I$w?]`T">
                    <mutation items="6"></mutation>
                    <value name="ADD0">
                      <block type="math_number" id="BL!YiMCNpWnWP3`8(A|R">
                        <field name="NUM">85</field>
                      </block>
                    </value>
                    <value name="ADD1">
                      <block type="math_number" id="nfsbT_Hg56=cJxf^jjq%">
                        <field name="NUM">86</field>
                      </block>
                    </value>
                    <value name="ADD2">
                      <block type="math_number" id="X6]cnQ2zOIs]K8NAmi00">
                        <field name="NUM">80</field>
                      </block>
                    </value>
                    <value name="ADD3">
                      <block type="math_number" id="D`T{]/E.TU?.=gZF,L@%">
                        <field name="NUM">78</field>
                      </block>
                    </value>
                    <value name="ADD4">
                      <block type="math_number" id="]Y)!x/|5QMLIj$BXGUj.">
                        <field name="NUM">77</field>
                      </block>
                    </value>
                    <value name="ADD5">
                      <block type="math_number" id="NQEJVgZ|3g,1!*Rw(*es">
                        <field name="NUM">54</field>
                      </block>
                    </value>
                  </block>
                </value>
                <next>
                  <block type="variables_set" id="4xve%IIB@{:HSdCmMlhz">
                    <field name="VAR">intArrayAgainst</field>
                    <value name="VALUE">
                      <block type="lists_create_with" id="yg5WK_CT;c4NHfYjzGX`">
                        <mutation items="6"></mutation>
                        <value name="ADD0">
                          <block type="math_number" id="qG(Fs#%*LH%v4YXwJK;!">
                            <field name="NUM">33</field>
                          </block>
                        </value>
                        <value name="ADD1">
                          <block type="math_number" id="RT4{]6Az,t0n/mgUc#N2">
                            <field name="NUM">26</field>
                          </block>
                        </value>
                        <value name="ADD2">
                          <block type="math_number" id="xPk6IEv7QLqG4gIGrh~|">
                            <field name="NUM">39</field>
                          </block>
                        </value>
                        <value name="ADD3">
                          <block type="math_number" id="!xGU3IvR,EL#%p~=k7-z">
                            <field name="NUM">42</field>
                          </block>
                        </value>
                        <value name="ADD4">
                          <block type="math_number" id="/v,N~7*n~)EY{;Cf.qjc">
                            <field name="NUM">44</field>
                          </block>
                        </value>
                        <value name="ADD5">
                          <block type="math_number" id="PHG_3$kalBc=l!)I5kMC">
                            <field name="NUM">29</field>
                          </block>
                        </value>
                      </block>
                    </value>
                    <next>
                      <block type="variables_set" id="#*S_iPtbpUNKU*uIFPiQ">
                        <field name="VAR">intFewestConceded</field>
                        <value name="VALUE">
                          <block type="math_on_list" id="2Lc!_@W|@?za]P]/FrDZ">
                            <mutation op="MIN"></mutation>
                            <field name="OP">MIN</field>
                            <value name="LIST">
                              <block type="variables_get" id="a/4V+8rix%jm-bavVkuw">
                                <field name="VAR">intArrayAgainst</field>
                              </block>
                            </value>
                          </block>
                        </value>
                        <next>
                          <block type="variables_set" id="5[_pnHoo@pd@bOVV*0T)">
                            <field name="VAR">strOutput</field>
                            <value name="VALUE">
                              <block type="text" id="sxZ{gLYAt|pAp;ZFf@wz">
                                <field name="TEXT"></field>
                              </block>
                            </value>
                            <next>
                              <block type="controls_for" id="IJ(1X;ny}.B9eH6H|q4[">
                                <field name="VAR">i</field>
                                <value name="FROM">
                                  <shadow type="math_number" id=",yeS3U,Fs8S;0Qg/+1G8">
                                    <field name="NUM">1</field>
                                  </shadow>
                                </value>
                                <value name="TO">
                                  <shadow type="math_number" id="T8d/HdcL^WE(nG.F#:yN">
                                    <field name="NUM">6</field>
                                  </shadow>
                                </value>
                                <value name="BY">
                                  <shadow type="math_number" id="X)H5@vj=kAp*3|4RSLc5">
                                    <field name="NUM">1</field>
                                  </shadow>
                                </value>
                                <statement name="DO">
                                  <block type="controls_if" id="=yRbWNx_V2F~6.B|Wa[_">
                                    <value name="IF0">
                                      <block type="logic_compare" id="[v0us~n[]Rl+b`n8j:Kr">
                                        <field name="OP">EQ</field>
                                        <value name="A">
                                          <block type="lists_getIndex" id="-;G/%X%g=[0CCTzk;W.Y">
                                            <mutation statement="false" at="true"></mutation>
                                            <field name="MODE">GET</field>
                                            <field name="WHERE">FROM_START</field>
                                            <value name="VALUE">
                                              <block type="variables_get" id="H6~3cFOrRU17zAJ$/h.%">
                                                <field name="VAR">intArrayAgainst</field>
                                              </block>
                                            </value>
                                            <value name="AT">
                                              <block type="variables_get" id="u8d55#%(xJuPv(6OGsv5">
                                                <field name="VAR">i</field>
                                              </block>
                                            </value>
                                          </block>
                                        </value>
                                        <value name="B">
                                          <block type="variables_get" id="m)([[+0~DHZEhs@Dxz~Y">
                                            <field name="VAR">intFewestConceded</field>
                                          </block>
                                        </value>
                                      </block>
                                    </value>
                                    <statement name="DO0">
                                      <block type="text_append" id="$b:q@9n$$ds$;oW]Z0mU">
                                        <field name="VAR">strOutput</field>
                                        <value name="TEXT">
                                          <shadow type="text" id="L;6osAQncY4qgjsn{wb!">
                                            <field name="TEXT"></field>
                                          </shadow>
                                          <block type="lists_getIndex" id="csQ]#!,ZBjl`upz4?#3q">
                                            <mutation statement="false" at="true"></mutation>
                                            <field name="MODE">GET</field>
                                            <field name="WHERE">FROM_START</field>
                                            <value name="VALUE">
                                              <block type="variables_get" id=";/9dT;*lz:MA`2%1$^4T">
                                                <field name="VAR">strTeamNamesArray</field>
                                              </block>
                                            </value>
                                            <value name="AT">
                                              <block type="variables_get" id="Si!CX9aC6tB.C^Q[K,Yp">
                                                <field name="VAR">i</field>
                                              </block>
                                            </value>
                                          </block>
                                        </value>
                                        <next>
                                          <block type="text_append" id="+si7wPe#w.rozS?W5Mv9">
                                            <field name="VAR">strOutput</field>
                                            <value name="TEXT">
                                              <shadow type="text" id="OtiMjK,tirW;T:iGjj%B">
                                                <field name="TEXT"> conceded the fewest goals  </field>
                                              </shadow>
                                              <block type="text_join" id="L)Vh.R?}T_Fo8l[I-iV$">
                                                <mutation items="9"></mutation>
                                                <value name="ADD0">
                                                  <block type="text" id="1QiV3*#2?bG=irtZvDDi">
                                                    <field name="TEXT"> in position </field>
                                                  </block>
                                                </value>
                                                <value name="ADD1">
                                                  <block type="variables_get" id="fTb2+em+WlhS,NbWh,wc">
                                                    <field name="VAR">i</field>
                                                  </block>
                                                </value>
                                                <value name="ADD2">
                                                  <block type="text" id="C-6gGPU*Im.z*hNSuP/5">
                                                    <field name="TEXT">   conceded the fewest goals  (</field>
                                                  </block>
                                                </value>
                                                <value name="ADD3">
                                                  <block type="variables_get" id="Oet6|%c4HYkNeM^xXRD:">
                                                    <field name="VAR">intFewestConceded</field>
                                                  </block>
                                                </value>
                                                <value name="ADD4">
                                                  <block type="text" id="[w(JfjvtnCnBgL{=zJ7~">
                                                    <field name="TEXT">). They scored </field>
                                                  </block>
                                                </value>
                                                <value name="ADD5">
                                                  <block type="lists_getIndex" id="!u*Sy0ydY^k@+BBeQt/?">
                                                    <mutation statement="false" at="true"></mutation>
                                                    <field name="MODE">GET</field>
                                                    <field name="WHERE">FROM_START</field>
                                                    <value name="VALUE">
                                                      <block type="variables_get" id=";2k.dZR#vYBG.?ehfCwg">
                                                        <field name="VAR">intArrayFor</field>
                                                      </block>
                                                    </value>
                                                    <value name="AT">
                                                      <block type="variables_get" id="IKTjNVA9$F/+t5#0CWu(">
                                                        <field name="VAR">i</field>
                                                      </block>
                                                    </value>
                                                  </block>
                                                </value>
                                                <value name="ADD6">
                                                  <block type="text" id=")@+%RD/1,O?-8W3Om6~Q">
                                                    <field name="TEXT"> goals and obtained </field>
                                                  </block>
                                                </value>
                                                <value name="ADD7">
                                                  <block type="lists_getIndex" id="`!2IqZAP9D_AwJNtbu#D">
                                                    <mutation statement="false" at="true"></mutation>
                                                    <field name="MODE">GET</field>
                                                    <field name="WHERE">FROM_START</field>
                                                    <value name="VALUE">
                                                      <block type="variables_get" id="4[)X1*c72g{^CkkJyIRi">
                                                        <field name="VAR">intArrayPoints</field>
                                                      </block>
                                                    </value>
                                                    <value name="AT">
                                                      <block type="variables_get" id="2fcPOjd?]YY18(`6]LLf">
                                                        <field name="VAR">i</field>
                                                      </block>
                                                    </value>
                                                  </block>
                                                </value>
                                                <value name="ADD8">
                                                  <block type="text" id="k^a^$2(m2QZjhc+5|oL8">
                                                    <field name="TEXT"> points.</field>
                                                  </block>
                                                </value>
                                              </block>
                                            </value>
                                          </block>
                                        </next>
                                      </block>
                                    </statement>
                                  </block>
                                </statement>
                                <next>
                                  <block type="text_print" id="eW+g~.RHFwms+B~w],R.">
                                    <value name="TEXT">
                                      <shadow type="text" id="G4(@_T-uTdU_HUZDXsry">
                                        <field name="TEXT">abc</field>
                                      </shadow>
                                      <block type="variables_get" id="[Os`Ep|+zYA1Py~(k`ON">
                                        <field name="VAR">strOutput</field>
                                      </block>
                                    </value>
                                  </block>
                                </next>
                              </block>
                            </next>
                          </block>
                        </next>
                      </block>
                    </next>
                  </block>
                </next>
              </block>
            </next>
          </block>
        </next>
      </block>
    </next>
  </block>
</xml>

Generated Smart Pascal Code

var intArrayAgainst: TIntArray;
var intArrayFor: TIntArray;
var intArrayPoints: TIntArray;
var intFewestConceded: Integer;
var strOutput: String;
var strTeamNames: String;
var strTeamNamesArray: TStrArray;


function MinValueFloat(Arr: TFloatArray): Float;
begin
  Result := Arr[0];
  for var i := 1 to Arr.Length - 1 do
    if Arr[i] < Result then
    Result := Arr[i];
end;


function MinValueInt(Arr: TIntArray): Integer;
begin
  Result := Arr[0];
  for var i := 1 to Arr.Length - 1 do
    if Arr[i] < Result then
    Result := Arr[i];
end;


function Str(v: Variant) : string;
begin
  asm
    if (@v === 0) {
      @Result = '0';
    }
    else if (@v === '') {
      @Result = '';
    }
    else if (isNaN(@v)) {
      @Result = @v;
    }
    else {
      @Result = (@v).toString();
    }
  end;
end;



strTeamNames := 'Chelsea,Tottenham Hotspur,Manchester City,Liverpool,Arsenal,Manchester United';
strTeamNamesArray := StrSplit(strTeamNames, ',');
intArrayPoints := [93, 86, 78, 76, 75, 69];
intArrayFor := [85, 86, 80, 78, 77, 54];
intArrayAgainst := [33, 26, 39, 42, 44, 29];
intFewestConceded := MinValueInt(intArrayAgainst);
strOutput := '';
for var i := 1 to 6 do
begin
  if ((intArrayAgainst[(i - 1)] = intFewestConceded)) then
  begin
    strOutput += strTeamNamesArray[(i - 1)];
    strOutput += StrJoin([Str(' in position '), Str(i), Str('   conceded the fewest goals  ('), Str(intFewestConceded), Str('). They scored '), Str(intArrayFor[(i - 1)]), Str(' goals and obtained '), Str(intArrayPoints[(i - 1)]), Str(' points.')],'');
  end;
end;
Console.writeln(strOutput);

Generated JavaScript Code

var strOutput, i, intArrayPoints, intArrayFor, intFewestConceded, strTeamNamesArray, intArrayAgainst, strTeamNames;


strTeamNames = 'Chelsea,Tottenham Hotspur,Manchester City,Liverpool,Arsenal,Manchester United';
strTeamNamesArray = strTeamNames.split(',');
intArrayPoints = [93, 86, 78, 76, 75, 69];
intArrayFor = [85, 86, 80, 78, 77, 54];
intArrayAgainst = [33, 26, 39, 42, 44, 29];
intFewestConceded = Math.min.apply(null, intArrayAgainst);
strOutput = '';
for (i = 1; i <= 6; i++) {
  if (intArrayAgainst[(i - 1)] == intFewestConceded) {
    strOutput = String(strOutput) + String(strTeamNamesArray[(i - 1)]);
    strOutput = String(strOutput) + String([' in position ',i,'   conceded the fewest goals  (',intFewestConceded,'). They scored ',intArrayFor[(i - 1)],' goals and obtained ',intArrayPoints[(i - 1)],' points.'].join(''));
  }
}
window.alert(strOutput);

Generated Python Code

strOutput = None
i = None
intArrayPoints = None
intArrayFor = None
intFewestConceded = None
strTeamNamesArray = None
intArrayAgainst = None
strTeamNames = None


strTeamNames = 'Chelsea,Tottenham Hotspur,Manchester City,Liverpool,Arsenal,Manchester United'
strTeamNamesArray = strTeamNames.split(',')
intArrayPoints = [93, 86, 78, 76, 75, 69]
intArrayFor = [85, 86, 80, 78, 77, 54]
intArrayAgainst = [33, 26, 39, 42, 44, 29]
intFewestConceded = min(intArrayAgainst)
strOutput = ''
for i in range(1, 7):
  if intArrayAgainst[int(i - 1)] == intFewestConceded:
    strOutput = str(strOutput) + str(strTeamNamesArray[int(i - 1)])
    strOutput = str(strOutput) + str(''.join([str(x) for x in [' in position ', i, '   conceded the fewest goals  (', intFewestConceded, '). They scored ', intArrayFor[int(i - 1)], ' goals and obtained ', intArrayPoints[int(i - 1)], ' points.']]))
print(strOutput)

Generated PHP Code

$strOutput;
$i;
$intArrayPoints;
$intArrayFor;
$intFewestConceded;
$strTeamNamesArray;
$intArrayAgainst;
$strTeamNames;


$strTeamNames = 'Chelsea,Tottenham Hotspur,Manchester City,Liverpool,Arsenal,Manchester United';
$strTeamNamesArray = explode(',', $strTeamNames);
$intArrayPoints = array(93, 86, 78, 76, 75, 69);
$intArrayFor = array(85, 86, 80, 78, 77, 54);
$intArrayAgainst = array(33, 26, 39, 42, 44, 29);
$intFewestConceded = min($intArrayAgainst);
$strOutput = '';
for ($i = 1; $i <= 6; $i++) {
  if ($intArrayAgainst[($i - 1)] == $intFewestConceded) {
    $strOutput .= $strTeamNamesArray[($i - 1)];
    $strOutput .= implode('', array(' in position ',$i,'   conceded the fewest goals  (',$intFewestConceded,'). They scored ',$intArrayFor[($i - 1)],' goals and obtained ',$intArrayPoints[($i - 1)],' points.'));
  }
}
print($strOutput);

Copy of Output

Tottenham Hotspur in position 2 conceded the fewest goals (26).
They scored 86 goals and obtained 86 points.
PrevGreen03.png
NextGreen03.png
UpGreen03.png
Programming - a skill for life!

XML, images and generated Smart Pascal code of examples including loops, arrays, validation and recursion

  1. Demonstration of loops
    Simple programs that output the 75 times table and input words from the user
  2. Searching an array
    How to perform a linear search of an array using Blockly
  3. Converting strings to integers
    XML, image and generated Smart Pascal code of demonstration of converting strings to integers
  4. Rounding floats
    How to round a float to a given number of decimal places
  5. Sum, maximum and minimum of arrays
    Example showing the use of the list functions sum, min and max
  6. Subarrays, combining arrays, array sorting and converting arrays to text
    How to copy a subarray from an array, combine arrays, sort an array and convert an array to text
  7. Parallel Arrays
    XML, image and generated Smart Pascal, JavaScript, Python and PHP code of demonstration of parallel arrays
  8. Arithmetic progression
    XML, image and generated Smart Pascal, JavaScript and Python code of demonstration of arithmetic progression
  9. Geometric progression
    XML, image and generated Smart Pascal, JavaScript and Python code of demonstration of geometric progression
  10. Vowel Count
    XML, image and generated Smart Pascal, JavaScript and Python code of demonstration of counting vowels in a word by two methods
  11. Validation using Blockly
    Introduction to validation (length check, range check, presence check, type check and character check)
  12. Recursion and its use for calculating factorials
    XML, image and generated Smart Pascal, JavaScript and Python code of demonstration of recursion for calculating factorials required for the display of Pascal's triangle
  13. Formatting the output with HTML and inline CSS
    XML, image and generated Smart Pascal code of demonstration of use of HTML and CSS
  14. Drawing on a Canvas
    XML, image and generated Smart Pascal code of demonstration of drawing on a canvas
  15. Using the random integer block to create a random identifier
    How to use the random integer block to create a random string for use as an identifier
  16. Generating Smart Pascal code that outputs XML code for a block
    A Blockly example that generates Smart Pascal code to output the XML representation of a block containing an array of numbers entered by the user as a comma-separated list
dita powered logo dita powered™. Copyright © 2010-21 Pascal Programming for Schools. All rights reserved.