What is the difference between
!== operators. Are there more such operators?
!== are strict comparison operators:
strictequality the objects being compared must have the same type and:
- Two strings are strictly equal when they have the same sequence of characters, same length, and same characters in corresponding positions.
- Two numbers are strictly equal when they are numerically equal (have the same number value).
NaNis not equal to anything, including
NaN. Positive and negative zeros are equal to one another.
- Two Boolean operands are strictly equal if both are true or both are false.
- Two objects are strictly equal if they refer to the same
===). [I.e. (
The 3 equal signs mean "equality without type coercion". Using the triple equals, the values must be equal in type as well.
0 == false // true 0 === false // false, because they are of a different type 1 == "1" // true, automatic type conversion for value only 1 === "1" // false, because they are of a different type null == undefined // true null === undefined // false '0' == false // true '0' === false // false
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