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Different between == and === in JavaScript examples


This post covers examples and notes about the comparison of double equal signs(==) and triple equal signs(===) operators in JavaScript.

First, what do equal signs about?

Both operators are used to compare different values.

== is called equality operator, which applies type coercion, what doe type coercion, It converts the values before comparison

m==n returns true if m and n are the same values and types, else false.

=== is called identity operators, which do not apply type coercion, not converting the values before conversion.

m===n returns true if m and n are the same values for strings and the same reference for objects, else false.

== and === operator Examples

Here are some examples of double equal and three equal operator examples

5=="5"  - true
5==="5" - false

'0' == undefined // true
'0' === undefined // false

null == undefined // true
null === undefined // false

difference between == vs === operators

Both operators are applied two operands or variables

== operator === operators
Called Comparison operator Strict comparison operator
compared two operands or variables, the data type is ignored compared two operands or variables and data type

|Returns true, if values are equal, false not equal| Returns true, if values and types are equal, false both not equal| |duration| time in milliseconds shown before disappearing from the page| |type coercion before comparison| type coercion ignored before comparison|

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