0 === "" is false.
0 == ''
The left operand is of the type Number.
The right operand is of the type String.
In this case, the right operand is coerced to the type Number:
0 == Number('')
which results in
0 == 0
From the Abstract Equality Comparison Algorithm (number 4):
If Type(x) is Number and Type(y) is String, return the result of the comparison x == ToNumber(y).
©2020 All rights reserved.