For loops in angularjs

Question

I am using angularjs. I have two for loops, one incrementing as 0, 2 and other as 1, 3... Is there a more elegant way to do this? Such as, a variable which alternates its value for every loop iteration so that the two loops can be combined? Thanks.

for ( jCounter= 0; jCounter< truthArray.length; jCounter+=2 ) {
    for ( iCounter= 0 ; iCounter< truthArray.length; iCounter++ ) {
        if (index.indexOf(iCounter) === jCounter&& index.indexOf(iCounter) !== -1) {
            last[iCounter] = 'left';
        }
    }
}
            
for ( jCounter= 1; jCounter< truthArray.length; jCounter+=2 ) {
    for ( iCounter= 0 ; iCounter< truthArray.length; iCounter++ ) {
        if (index.indexOf(iCounter) === jCounter&& index.indexOf(iCounter) !== -1) {
            last[iCounter] = 'right';
        }
    }
}

`map[i] = i % 2 === 0 ? 'left' : 'right';` – Rayon Oct 25 '18 at 07:50 — Rayon, Oct 25 '18 at 07:50

score 0 · Accepted Answer · answered Oct 25 '18 at 07:52

This will do the work

for ( jCounter= 0; jCounter< truthArray.length; jCounter++ ) {
  for ( iCounter= 0 ; iCounter< truthArray.length; iCounter++ ) {
    if (index.indexOf(iCounter) > -1 && index.indexOf(iCounter) === jCounter) {
      last[iCounter] = jCounter%2 == 0 ? 'left' : 'right';                            
    }
  }
}

score 0 · Answer 2 · answered Oct 25 '18 at 07:54

You can use modulo % to know if it's an odd or even number.

for (let jCounter = 0; jCounter< truthArray.length; jCounter++ ) {
    for (let iCounter = 0 ; iCounter< truthArray.length; iCounter++ ) {
        if (index.indexOf(iCounter) === jCounter && index.indexOf(iCounter) !== -1) {
            last[iCounter] = jCounter % 2 === 0 ? 'left' : 'right';
        }
    }
}

Also, you should declare a variable before using it (jCounter and iCounter). In strict mode is forbidden.

score 0 · Answer 3 · answered Oct 25 '18 at 09:45

0

Try do this format...

for ( jCounter= 0; jCounter< truthArray.length; jCounter++ ) {

   for ( iCounter= 0 ; iCounter< truthArray.length; iCounter++ ) {

                   //write something here.

} }

answered Oct 25 '18 at 09:45

BingHao

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For loops in angularjs

3 Answers3