Problem with '.data()' and its value within an if

Question

I’m creating some If's not to lose the habit of using them, but when trying something a little different from what I usually do, an error occurs, the if does not work. How can I fix ? I tried in the following ways:

if($('.carousel-indicators li.active').data('slide-to').val() = 0){
    console.log('Teste');
};
ERRO : Uncaught ReferenceError: Invalid left-hand side in assignment

and

if($('.carousel-indicators li.active').data('slide-to') = 0){
    console.log('Teste');
};
ERRO : Uncaught TypeError: $(...).data(...).val is not a function

Answer 1

When you compare something you need to use == or === (Strict comparison).
The = is to assign value to some variable.

Answer 2

Two problems:

• the .data() already gives you a String, you do not need (nor should you) use .val()

• comparison should be made with == or ===, use only = is an assignment.

Solution:

if($('.carousel-indicators li.active').data('slide-to') == 0){
    console.log('Teste');
};