Angular JS break ForEach

The angular.forEach loop can't break on a condition match.

My personal advice is to use a NATIVE FOR loop instead of angular.forEach.

The NATIVE FOR loop is around 90% faster then other for loops.

USE FOR loop IN ANGULAR:

var numbers = [0, 1, 2, 3, 4, 5];

for (var i = 0, len = numbers.length; i < len; i++) {
  if (numbers[i] === 1) {
    console.log('Loop is going to break.'); 
    break;
  }
  console.log('Loop will continue.');
}

There's no way to do this. See https://github.com/angular/angular.js/issues/263. Depending on what you're doing you can use a boolean to just not going into the body of the loop. Something like:

var keepGoing = true;
angular.forEach([0,1,2], function(count){
  if(keepGoing) {
    if(count == 1){
      keepGoing = false;
    }
  }
});

Use the Array Some Method

 var exists = [0,1,2].some(function(count){
      return count == 1
 });

exists will return true, and you can use this as a variable in your function

if(exists){
    console.log('this is true!')
}

Array Some Method - Javascript

As far as I know, Angular doesn't provide such a function. You may want to use underscore's find() function for this (it's basically a forEach which breaks out of the loop once the function returns true).

http://underscorejs.org/#find

If you use jQuery (hence not jqLite) in conjunction with AngularJS you can iterate with $.each - which allows breaking and continuing based on boolean return value expression.

JSFiddle:

http://jsfiddle.net/JEcD2/1/

Javascript:

var array = ['foo', 'bar', 'yay'];
$.each(array, function(index, element){
    if (element === 'foo') {
        return true; // continue
    }
    console.log(this);
    if (element === 'bar') {
        return false; // break
    }
});

Note:

Though using jQuery is not bad, both native Array.some or Array.every functions are recommended by MDN as you can read at native forEach documentation:

"There is no way to stop or break a forEach loop. The solution is to use Array.every or Array.some"

Following examples are provided by MDN:

Array.some:

function isBigEnough(element, index, array){
    return (element >= 10);
}
var passed = [2, 5, 8, 1, 4].some(isBigEnough);
// passed is false
passed = [12, 5, 8, 1, 4].some(isBigEnough);
// passed is true

Array.every:

function isBigEnough(element, index, array){
    return (element >= 10);
}
var passed = [12, 5, 8, 130, 44].every(isBigEnough);
// passed is false
passed = [12, 54, 18, 130, 44].every(isBigEnough);
// passed is true

please use some or every instances of ForEach,

Example for some:

var ary = ["JavaScript", "Java", "CoffeeScript", "TypeScript"];

ary.some(function (value, index, _ary) {
    console.log(index + ": " + value);
    return value === "JavaScript";
});

Example for every:

var ary = ["JavaScript", "Java", "CoffeeScript", "TypeScript"];

ary.every(function(value, index, _ary) {
    console.log(index + ": " + value);
    return value.indexOf("Script") > -1;
});

Find more information
http://www.jsnoob.com/2013/11/26/how-to-break-the-foreach/

Concretely, you can exit of a forEach loop, and of any place, throw an exception.

try {
   angular.forEach([1,2,3], function(num) {
      if (num === 2) throw Error();
   });
} catch(e) {
    // anything
}

However, it is better if you use other library or implement you own function, a find function in this case, so your code is most high-level.

var ary = ["JavaScript", "Java", "CoffeeScript", "TypeScript"];
var keepGoing = true;
ary.forEach(function(value, index, _ary) {
    console.log(index)
    keepGoing = true;
    ary.forEach(function(value, index, _ary) {
        if(keepGoing){ 
            if(index==2){
                keepGoing=false;
            }
            else{
                console.log(value)
            }

        }      
    });
});

Just add $index and do the following:

angular.forEach([0,1,2], function(count, $index) {
     if($index !== 1) {
          // do stuff
     }
}