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Value Comparison Operators
In javascript, the == operator does the type conversion of the operands before comparison, whereas the === operator compares the values and the data types of the operands. The Object.is() method determines whether two values are the same value: Object.is(value1, value2).
Object.is() is not equivalent to the == operator. The == operator applies various coercions to both sides (if they are not the same type) before testing for equality (resulting in such behavior as "" == false being true), but Object.is() doesn't coerce either value.
Object.is() is also not equivalent to the === operator. The only difference between Object.is() and === is in their treatment of signed zeros and NaN values. The === operator (and the == operator) treats the number values -0 and +0 as equal but treats NaN as not equal to each other.
Free Content The Difference Between == and === in Javascript Equality comparisons and sameness - MDN