How can I replace a javascript for loop with a forEach and get access to the index for each iteration?

Question

I have this Javascript:

factory.remove = function (arr, property, num) {
    for (var i = arr.length - 1; i >= 0; --i) {
        if (arr[i][property] === num)
            arr.splice(i, 1);
    }
};

Can someone tell me how I could change the for loop to use a .forEach instead? What I am not sure about is how in the forEach I can access the i ? Also if I use the forEach will I be able to do a splice of that array or is it not possible?

What do you believe is the advantage of foreach over for here? — Jongware
– Jongware, Commented Jul 25, 2014 at 12:12
If you have to: yes, it's second argument in the forEach callback. — Adriano Repetti
– Adriano Repetti, Commented Jul 25, 2014 at 12:14

Mritunjay · Accepted Answer · 2014-07-25 12:16:26Z

4

This code

for (var i = arr.length - 1; i >= 0; --i) {
        if (arr[i][property] === num)
            arr.splice(i, 1);
    }

could be written like this

arr.forEach(function(elem,index){
    if(elem[property]===num)
       arr.splice(index, 1);
})

answered Jul 25, 2014 at 12:16

Mritunjay

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