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What is the difference between “==” and “===”?

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Though not a jQuery specific question, this basic JavaScript operators are pretty important to understand.

“===” means that they are identical.

“==” means that they are equal in value.

( == )

Each JavaScript value is of a specific “type” (Numbers, strings, Booleans, functions, and objects). So if you try to compare a string with a number, the browser will try to convert the string into a number before doing the comparison.

So the following will return true.

55 == “55” //true

0 == false //true

1 == true //true

(===)
The === operator will not do the conversion, if two values are not the same type it will return false. In other words, this returns true only if the operands are strictly equal in value or if they are identical objects.

55 === “55” //false

0 === false //false

1 === true //false

var a = [1, 2, 3];

var b = [1, 2, 3];

var c = a;

var is_ab_eql = (a === b); // false (Here a and b are the same type,and also have the same value)

var is_ac_eql = (a === c); // true.

Value types (numbers):

a === b returns true if a and b have the same value and are of the same type.

Reference types:

a === b returns true if a and b reference the exact same object.

Strings:

a === b returns true if a and b are both strings and contain the exact same characters.

var a = “ab” + “c”;

var b = “abc”;

a === b //true

a == b //true

in thiss case the above condition will fail

var a = new String(“abc”);

var b = “abc”;

a === b //false

a == b// true

… since a and b are not a same type.

typeof “abc”; // ‘string’

typeof new String(“abc”)); // ‘object

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