reference javascript variable through concatenation

Question

I have few javascript variables:

var column1
var column2
var column3
etc...

I have a for loop,

for (i=1; i<10; i++) {}

I would like to loop through and reference these variable inside the for loop. How do I reference each column variable individually? I'm looking to do something like this:

for (i=1; i<10; i++) {
  columni = i;
}

so at the end of this I'll have:

column1 = 1
column2 = 2
column3 = 3

you could use eval.................. but you're probably better off with @brso05's answer — sg.cc
– sg.cc, Commented Feb 16, 2016 at 17:01

brso05 · Accepted Answer · 2016-02-16 16:59:21Z

2

You can create an object wrapper and access them that way:

var columns = {"column1":"", "column2":"", "column3":""};

for (i=1; i<10; i++) {
    columns[("column" + i)] = i;
}

columns.column1 = 1
columns.column2 = 2
columns.column3 = 3

answered Feb 16, 2016 at 16:59

brso05

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2 Comments

Brian Powell Over a year ago

I thought that might be the way I had to do it. Thanks for confirming this. I just didn't want to re-write a bunch of code to put them in an object if I didn't have to.

brso05 Over a year ago

@BrianPowell an alternative if your variables are global is this: stackoverflow.com/a/1920939/4028085

Niklesh Raut · Accepted Answer · 2016-02-16 17:12:11Z

1

I did something like this in jQuery, you can also use.

<script type="text/javascript">
    newVar = "";
    for (i=1; i<10; i++) {
      newVar += "var column"+i+" = "+i+";";
    }
    $("<script>").html(newVar).appendTo("head");
</script>

answered Feb 16, 2016 at 17:12

Niklesh Raut

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1 Comment

Brian Powell Over a year ago

Perfect. I already rewrote this using the answer I accepted, but this actually answers my question perfectly as well. Thanks!

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