koozdra wrote:
> Thanks for the quick reply.
>
> I ran some tests in ruby:
>
> array = [1,2,3,4]
> p array.insert(-3, 'one', 'two')
> array = [1,2,3,4]
> p array.insert(-1, 'one', 'two')
> array = [1,2,3,4]
> p array.insert(0, 'one', 'two')
> array = [1,2,3,4]
> p array.insert(1, 'one', 'two')
> array = [1,2,3,4]
> p array.insert(10, 'one', 'two')
>
> output:
> [1, 2, "one", "two", 3, 4]
> [1, 2, 3, 4, "one", "two"]
> ["one", "two", 1, 2, 3, 4]
> [1, "one", "two", 2, 3, 4]
> [1, 2, 3, 4, nil, nil, nil, nil, nil, nil, "one", "two"]
>
> when the index is negative and of greater length than the array, ruby
> throws an index out of bounds exception.
>
Based on that info, below is a revised method. On FF2 it seems to behave the
same as your Ruby examples. I made an index of -5 in your example work the
same as 0.
- Ken
Array.prototype.insert = function() {
var args = $A(arguments), index = args.shift();
index += index < 0 ? this.length : 0;
if (index > this.length || index < -1)
throw new Error('Index out of bounds.');
args = [this[index], 0].concat(args);
Array.prototype.splice.apply(this, args);
}
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