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How to push values from one array to another

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Mar 29.2011

Let’s say i have two arrays:

var array1 = [“1″,”2″,”3”];

var finalArray = [];

and I want to dump the values of array1 into finalArray several times to end up with the value of finalArray being:

“1”,”2″,”3″,”1″,”2″,”3″,”1″,”2″,”3″

What would be the easiest way to dump the values into the other without making it multidimensional?

thanks

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JavaScript

7 Comments(s) ↴

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@JMRKERMar 29.2011 — Possibly consider using the concat() function.

See: http://www.w3schools.com/jsref/jsref_concat_array.asp
<i>
</i>var finalArray = [].concat(array1,array1,array1);
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@JericoauthorMar 30.2011 — thanks. That saves a bit of code. However, I had to do it like this:

[CODE]function(num){
for(var i=0;i<num;i++){
this.myArray2 = this.myArray2.concat(this.myArray1);

}[/CODE]
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@mrhooMar 30.2011 — You shouldn't need the loop-

JMRKER's code works in all the browsers I have handy:

[CODE]var A=[1,2,3,4,5];
A=A.concat(A,A,A);
alert(A)[/CODE]

returned value: (Array)

[1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5]
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@JericoauthorMar 30.2011 — I need the loop because 'num' can be any number passed to the function.
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@JMRKERMar 30.2011 — thanks. That saves a bit of code. However, I had to do it like this:

[CODE]function(num){
for(var i=0;i<num;i++){
this.myArray2 = this.myArray2.concat(this.myArray1);

}[/CODE][/QUOTE]

Why did you have to change it? Are you trying to use it in a prototype assignment?

?
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@JericoauthorMar 30.2011 — I don't know what a prototype assignment is.

My point is that the number of times the arrays need to be concatenated is dynamic. If I knew ahead of time how many times, then your way would be fine - hence the loop.
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@JMRKERMar 30.2011 — Dynamic assignment is OK. No problem with function use then.

I was questioning the use of 'this' in the function.

It is typically used when defining a prototype function.

I'm not sure it is needed in your function, but if it works to your needs, keep goin' ?
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