Hi,
please have a quick look at this CodePen:
When I console.log() the length of the array, it returns 0 … even though I can iterate through the array. Why is that?
Kind regards
Thomas
Hi,
please have a quick look at this CodePen:
When I console.log() the length of the array, it returns 0 … even though I can iterate through the array. Why is that?
Kind regards
Thomas
Hey,
This looks a bit like PHP to me:
var array = new Array;
array['a'] = 'a';
array['b'] = 'b';
array['c'] = 'c';
console.log(array.length);
for (var key in array) {
console.log(key);
}
PHP does not distinguish between indexed and associative arrays, whereas JavaScript does (in so far as JS only has indexed arrays*, for an associative array you would use an object).
var array = [];
array[0] = 'a';
array[1] = 'b';
array[2] = 'c';
console.log(array.length);
=> 3
Perhaps you are trying to do this:
var obj = {
"a": "1",
"b": "2",
"c": "3"
}
console.log(obj.a);
=> 1
This might help: How to Create and Manipulate Arrays in JavaScript
* Kinda: http://stackoverflow.com/questions/1076658/javascript-array-associative-and-indexed
What you’re doing in your pen is adding additional properties to your array object, not array-elements. This doesn’t increment its length, and you can’t access these properties with native array methods – e.g. try array.pop()
, which will return undefined
. If you want to get the “length” of your object, try
console.log(Object.keys(array).length);
instead. Iterating over the (enumerable) properties works for any object however, which is why you’re getting the output you’re expecting in the for ... in
loop.
Wow, thanks so much!
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