Question

If I have a list in Python, I can check whether a given value is in it using the in operator:

>>> my_list = ['a', 'b', 'c']

>>> 'a' in my_list
True

>>> 'd' in my_list
False

If I have an array in JavaScript, e.g.

var my_array = ['a', 'b', 'c'];

Can I check whether a value is in it in a similar way to Python’s in operator, or do I need to loop through the array?

Answer 1

var my_array = ['a', 'b', 'c'];
alert(my_array.indexOf('b'));
alert(my_array.indexOf('dd'));

if element not found, you will receive -1