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Asked: 2026-06-16T02:51:00+00:00

When I try to push elements into a javascript array, it doesn’t work. This

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When I try to push elements into a javascript array, it doesn’t work.
This is the simplest sample I can come up with.
Why doesn’t this work?

    <!DOCTYPE html>
    <html>
    <body>

    <script>
    var i;
    var mycars = new Array();

    for(i=1;i<=10;i++){
      mycars.push[ i.toString()+"-" ];
    }

    alert(mycars.join(""));

    </script>

    </body>
    </html>
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1 Answer

  1. Editorial Team

    push is a function. You call functions with (), not []:

    mycars.push( i.toString()+"-" );
// here ---^     and here ----^

    Where you probably got confused is that you can add to an array without using push, just by assigning to an array element, even if that element doesn’t exist yet. So for instance, your loop could look like this:

    for(i=1;i<=10;i++){
  mycars[mycars.length] = i.toString()+"-";
}

    There, because I’m referring to an array element (mycars[mycars.length]), not calling a function, I use [].

    Side note: Rather than var mycars = new Array();, just write var mycars = [];. It does the same thing but is more concise and not prone to side effects.

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