Question

179

Selectively push items to an array

rated 0 times [ 183] [ 4] / answers: 1 / hits: 5623 / 10 Years ago, thu, may 8, 2014, 12:00:00

So if I had:

A=['a','b','c'];

B=[];



for (var i = 0;i<7;i++){

   B.push(A[i])

}

I would get

B=[a, b, c, undefined, undefined, undefined, undefined]

Instead I want

B= [a,b,c]

So I guess I would need something like

for (var i = 0;i<7;i++){

   B.push(A[i] unless A[i] is undefined. Then don't push anything)

}

How would I do this in Javascript?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

denzelc

Add To Favorites

Follow

Total Points: 637

Total Questions: 89

Total Answers: 88

Location: Liechtenstein

Member since Wed, Dec 8, 2021

3 Years ago

answered 10 Years ago sandra · Accepted Answer

An Object Oriented Aspect

=> After that code, clean your array :

B.clean();

Known that clean is an extension of array Class(OOP context)

Array.prototype.clean=function(){

    var newArray = [];

    for(var index = 0; index < this.length; index++) {

        if(this[index]) {

            newArray.push(this[index]);

        }

    }

    return newArray;

};