Javascript Compare values in 2 arrays

Question

What would be a shorter way to write :

if (array1[0] >= array2[0] && array1[1] >= array2[1] && ...) {
do something;
}

I tried creating a function but I was not able to make it work, I'm still quite new at this.

Refer this link with a similar Question posted
http://stackoverflow.com/questions/3432929/comparing-two-arrays-in-javascript-returning-differences — Devendra Lattu, Dec 13 '13 at 14:54

Benjamin Gruenbaum · Accepted Answer · 2013-12-13T15:30:51.737

3

The most elegant way would be to use .every

The every() method tests whether all elements in the array pass the test implemented by the provided function.

if (array1.every(function(e,i){ return e>=array2[i];})) {
    do something;
}

edited Dec 13 '13 at 15:30

answered Dec 13 '13 at 14:58

Benjamin Gruenbaum

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+1 For the most elegant solution. I deleted my answer which was basically identical, but slower :) . – Tibos Dec 13 '13 at 15:01
I tried this one but I'm getting a syntax error "missing ; before statement". – Trax Dec 13 '13 at 15:29
Yeah, I'm missing a } here, one sec... Fixed. @user3099816 – Benjamin Gruenbaum Dec 13 '13 at 15:30

Shryme · Answer 2 · 2013-12-13T15:02:05.597

0

var isGreater = true;
for (var i = 0; i < array1.length; i++)
{
    if (array1[i] < array2[i])
    {
        isGreater = false;
        break;
    }
}

if (isGreater)
{
    //do something
}

You loop your first array and replace the numbers by the looping variable (i)

edited Dec 13 '13 at 15:02

answered Dec 13 '13 at 14:54

Shryme

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This doesn't answer the question, which is that *all* elements of of the first are greater than the second, not *some*. – Joe Dec 13 '13 at 14:57
looking at his example, he was doing arr1[0] vs arr2[0], arr1[1] vs arr2[1], that's what my for loop is doing, he never asked how to check everything with everything – Shryme Dec 13 '13 at 14:59
I disagree. Look at his logic, it's `&&`ing all the conditions. – Joe Dec 13 '13 at 15:00

score 0 · Answer 3 · answered Dec 13 '13 at 14:55

This will return true if all elements of a are greater than all elements of b. It will return as early as possible rather than having to compare all of the elements.

function compare(a, b) {
  for (i = 0; i < a.length; i++) {
      if (a[i] < b[i]) { return false;}
  }
  return true
 }

Javascript Compare values in 2 arrays

3 Answers3