Question

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Functional approach to basic array construction

I am new to js. I just want to know which one is the right approach. Below I have posted my code.

var doubles = (i*20 for (i in it));
var doubles ={i*20 for (i in it)};

Thanks

Answer 1

You should use ordinary for loops when iterating over arrays. for…in is used for iterating over object properties.

So, the correct way is:

for (var i = 0; i < array.length; ++i) {
    // do something
}

To iterate over object properties:

for (var prop in obj) {
     // do something with prop
}