== performs type coercion before comparison (loose equality), while === compares both value and type without coercion (strict equality).
JavaScript has two equality operators:
== (Loose Equality)
=== (Strict Equality)
Best Practice: Always use === unless you specifically need type coercion.
// Loose equality (==) - type coercion happens
5 == '5' // true (string '5' converted to number)
0 == false // true (false converted to 0)
'' == false // true (both convert to 0)
null == undefined // true (special case)
// Strict equality (===) - no type coercion
5 === '5' // false (different types)
0 === false // false (different types)
'' === false // false (different types)
null === undefined // false (different types)Using value == null to catch both null and undefined in a single check (acceptable use of ==)
Strict comparison ensures type safety when validating user input against expected values
Using strict equality to verify response data types match expected schema
Build an interactive tool showing type coercion results for all type combinations
Create a game testing knowledge of == vs === behavior with edge cases