= vs ==

Question

What's the difference? if(a=b) vs if(a==b)

Answer 1

Assignment Operators
https://www.sololearn.com/learn/2282/?ref=app

Answer 2

(a=b) mean the value of a is b which is defined by =
example
var b=10;
var c=20;
var a=b;
document.write(a+c)
output,*=30

and
(a==)it is used to compare if the value of a is equal to value of b

Answer 3

= assigns value

== compares value

Answer 4

@Shudarshan Rai, @Immortal, could you elaborate on the assignment operator? (=)

Answer 5

@Immortal Ahh got you, okay so that's why we setup a second = to clarify that it's just to check the equality.

Answer 6

= is assignment operator
For example,
int a=5;
i.e., the value in right hand side is assigned to the variable in left hand side.
5 is assigned to a.

== is relational operator and we can say that it is a binary operator because we check for the equality of two variables.
For example,
int a=5,b=4;
if(a==b){}
In the above example the if statement checks whether the value in variable a is equal to the value in variable b.

When coming to your question the statement if(a=b) throws an error because if statement takes a relational expression only.....
Syntax :if(relational expression)
I think you know about relational expression...

Answer 7

== :V