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Difference between '==' and '===' in JavaScript

asked 2 months ago

483

I know this is basic, but can someone explain the difference between loose equality and strict equality with examples?

luciandima

•answered 1 month ago

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Compares values only
Performs type coercion (converts operands to the same type before comparing)

15 == "5"        // true   (string "5" is converted to number 5)
20 == false     // true   (false becomes 0)
3null == undefined // true

15 == "5"        // true   (string "5" is converted to number 5)
20 == false     // true   (false becomes 0)
3null == undefined // true

15 === "5"      // false (number vs string)
20 === false   // false (number vs boolean)
3null === undefined // false

15 === "5"      // false (number vs string)
20 === false   // false (number vs boolean)
3null === undefined // false

Sarah Smith

•answered 2 months ago

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I would recommend using a different approach. Try this library instead...