What is the difference between == and === in JavaScript?

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In JavaScript, == and === are comparison operators, but they behave differently:

== (Equality / Loose Equality)

  • Compares values only.

  • If the types are different, it performs type coercion (converts one value into the type of the other before comparing).

  • Example:

    5 == "5";   // true (string "5" is converted to number 5)
null == undefined; // true (special case in JS)
0 == false; // true

=== (Strict Equality)

  • Compares both value and type.

  • No type conversion is done. If types differ, it immediately returns false.

  • Example:

    5 === "5";   // false (number vs string)
5 === 5;     // true
null === undefined; // false
0 === false; // false

✅ Key difference:

  • == allows type conversion (loose check).

  • === requires same type and same value (strict check).

👉 Best practice: Use === (strict equality) to avoid unexpected bugs caused by type coercion.

Read More:



What are media queries?

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