Is JavaScript array index a string or an integer?

Question

I had a generic question about JavaScript arrays. Are array indices in JavaScript internally handled as strings? I read somewhere that because arrays are objects in JavaScri

Answer 1

That is correct so:

> var a = ['a','b','c']
undefined
> a
[ 'a', 'b', 'c' ]
> a[0]
'a'
> a['0']
'a'
> a['4'] = 'e'
'e'
> a[3] = 'd'
'd'
> a
[ 'a', 'b', 'c', 'd', 'e' ]