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What are truthy values in JavaScript?

Chidume Nnamdi

JavaScript has truthy and falsy values. Truthy values are Boolean values that resolve to true, while falsy values are values that resolve to Boolean false.

Truthy values

All other values are truthy values in JS unless they are defined as falsy.

The following are also truthy values:

  • ‘0’ (a string containing a single zero)
"0" && true
>> true

"0" && false
>> false

"0" || true
>> "0"
  • ‘false’ (a string containing the text “false”)
"false" && true
>> true

"false" && false
>> false

"false" || true
>> "false"
  • [] (an empty array)
[] && true
>> true

[] && false
>> false

[] || true
>> []
  • {} (an empty object)
{} && true
>> true

{} && false
>> false

{} || true
>> {}
  • function(){} (an “empty” function)
(function name(){}) && true
>> true

(function name(){}) && false
>> false

(function name(){}) || true
>> [Function: n]

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