js. splice returns removed item?

Question

I am having problem of understanding splice and I want to have help.

Please check the jsfiddle.

http://jsfiddle.net/fantill/TbpWf/1/

value = "c, a, b"
value = value.split(',').splice(1, 1).join(',')
alert(value);

the value is supposed have return 'c, b'.

However, it returns 'a';

What is wrong with this method?

Thank you very much.

Answer 1

.splice does return the removed item. However, it also manipulates the array internally. This prevents you from chaining anything to .splice; you must do two separate calls:

value = value.split(',');
value.splice(1, 1);
console.log(value.join(','));

If you do value = value.splice(...), value is overridden, and the array is lost!

Answer 2

.splice is in-place, so just remove the value = and it'll modify the array like you'd expect:

> var value = "c, a, b";
> value = value.split(', ');
["c", "a", "b"]
> value.splice(1, 1);
["a"]
> value
["c", "b"]

Answer 3

var a = ["1","2","3"]
a.splice(1,1) && a
a=["1","3"]