Returning an array with decimal values in a javascript function

Question

im having trouble returning an array that contains decimal values to a variable:

function foo() {
    var coords = new Array(39.3,18.2);
    console.log(coords[1]); //successfully logs 18.2
    return coords;
}

but then...

var result = foo();
alert(result[0]);

that last one throws this error: Uncaught TypeError: Cannot read property '0' of undefined

Shouldn't that be alert(result[0])? Everything else looks fine - I'd say the problem is somewhere else in your code.

missingno · Accepted Answer · 2011-09-20 18:27:19Z

As other people mentioned, alert is a function and needs parenthesis

alert(result[0])

That said, there are some extra points to note:

1) Use array literal syntax instead of new Array

var coords = [1.23, 3.45];

Its faster and new Array has some edge cases.

2) Most browsers have developer tools (usually reacheable by F12). This allows you to use the much more convenient console.log instead of alert.

@andufo: What does have to do with how you create the array? After the array is created they work just the same.

Daniel Elliott · Answer 2 · 2011-09-20 18:26:32Z

up vote 0 down vote

The problem is the missing parentheses around the alert statment

try

alert (result[0]);

answered Sep 20 '11 at 18:26

Daniel Elliott
12k22053

just.another.programmer · Answer 3 · 2011-09-20 18:23:04Z

up vote 4 down vote

You need to put parentheses around the argument to the alert function.

alert(result[0]);

answered Sep 20 '11 at 18:23

just.another.programmer
1,61111228

3 Answers