Question

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JavaScript === vs == : Does it matter which “equal” operator I use?
The 3 different equals

I’m trying to understand what is happening here:

 data.toPage = $('div#someID');

if ( typeof data.toPage === "string" ) {
      // sth
      console.log("hello");
      }

So I’m checking for a string am I not? I’m curious because my console “helloes”.

Thanks for some input!

Answer 1

==
This is the equal operator and returns a boolean true if both the operands are equal. JavaScript will attempt to convert different data types to the same type in order to make the comparison. Assuming ‘a’ to be 2 and ‘b’ to be 4, the following examples will return a value of true:

a == 2
a == "2"
2 == '2' 

===
This is the strict equal operator and only returns a Boolean true if both the operands are equal and of the same type. These next examples return true:

a === 2
b === 4