Why javascript treats 0 equal to empty string? [duplicate]

Answer 1

== does typecasting. Always use ===.

In your example, the empty string of b is being converted to 0. So both a and b are the same.

Answer 2

Because == checks value equality so false, 0 and empty strings are equals. Use identity check ===.

Answer 3

Javascript automatically converts variables of different types for comparison. That's a common feature in non-strictly typed languages.

If you need to compare variables and check the type, use the === operator.