How to break out from foreach loop in javascript [duplicate]

Question

I am newbie in Javascrript. I have a variable having following details:

var result = false;
[{"a": "1","b": null},{"a": "2","b": 5}].forEach(function(call){
    console.log(call);
    var a = call['a'];
    var b = call['b'];
    if(a == null || b == null){
        result = false
        break;
    }
});

I want to break the loop if there is NULL value for a key. How can I do it?

What loop? for (var i = 0... etc, a literal .forEach or what? — VLAZ
– VLAZ, Commented Oct 5, 2016 at 20:12
Just say break; inside of the forloop inside of the if statement that checks for the NULL value. — Nicholas Siegmundt
– Nicholas Siegmundt, Commented Oct 5, 2016 at 20:12
After update: yes, it's a duplicate of what Robbie reported. — VLAZ
– VLAZ, Commented Oct 5, 2016 at 20:15
I did checkout stackoverflow.com/questions/2641347/… link. However, I was not able to figure out the solution. Given link has simple(int,string) array. In my array I have object and need to check whether any property has null value. — Sahil
– Sahil, Commented Oct 5, 2016 at 20:54

Fathy · Accepted Answer · 2020-09-12 19:17:42Z

80

Use a for loop instead of .forEach()

var myObj = [{"a": "1","b": null},{"a": "2","b": 5}]
var result = false

for(var call of myObj) {
    console.log(call)
    
    var a = call['a'], b = call['b']
     
    if(a == null || b == null) {
        result = false
        break
    }
}

edited Sep 12, 2020 at 19:17

answered Oct 5, 2016 at 20:14

Fathy

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6 Comments

zwcloud Over a year ago

What if one can only use foreach?

Fathy Over a year ago

Why can you only use .forEach?

zwcloud Over a year ago

for in doesn't work for a Map. for of is not available in ES5. for(i=0; i<n; i++) needs to get values first, i.e. map.values(), I'm not sure if it harms performance because our WebGL app needs to loop through the map values every frame.

Fathy Over a year ago

If you care about performance use .forEach and ignore next calls when you have your result, this is the most efficient way to do it in ES5. Note that ES5 doesn't have Map so your are probably using a polyfill like core-js, native objects ({}) are faster in this case and can be iterated using for(var key in object).

kumail Over a year ago

you can also change the length of the array itself, this will cause the forEach to break

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