falsy values in javascript

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YOU.com answered on March 13, 2020 Popularity 7/10 Helpfulness 2/10

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falsy values in javascript

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// Falsy values in JavaScript: 
// false
// 0
// '', "", ``
// null
// undefined
// NaN

console.log(Boolean(false)); // false
console.log(Boolean(0)); // false
console.log(Boolean('')); // false
console.log(Boolean(null)); // false
console.log(Boolean(undefined)); // false
console.log(Boolean(NaN)); // false

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Contributed on Sep 12 2023

YOU.com

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javascript falsy values

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the number 0
the BigInt 0n
the keyword null
the keyword undefined
the boolean false
the number NaN
the empty string "" (equivalent to '' or ``)

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Contributed on Mar 13 2020

2 Programmers 1 Bug

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falsy values javascript

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// JS Essentials: Falsy Values

false
undefined
null
NaN
0 or +0 or -0
"" or '' or `` (empty string)

// Everything else is truthy

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Source: www.samanthaming.com

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Contributed on Jun 16 2021

Mehedi Islam Ripon

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falsy values in javascript

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Falsy values includes,
false 
0
"" (empty strings)
null
undefined
NaN

All other values are truthy.

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Contributed on Dec 29 2022

Chetan Nada

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falsy values javascript

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false		//The keyword false.
0			//The Number zero (so, also 0.0, etc., and 0x0).
-0			//The Number negative zero (so, also -0.0, etc., and -0x0).
0n, -0n		//The BigInt zero and negative zero (so, also 0x0n/-0x0n).
"", '', ``	//Empty string value.
null		//the absence of any value.
undefined	//the primitive value.
NaN			//not a number.

document.all	
//Objects are falsy if and only if they have the [[IsHTMLDDA]] internal slot.
//That slot only exists in document.all and cannot be set using JavaScript.

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Source: developer.mozilla.org

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Contributed on Feb 17 2021

OuzOzdemir

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falsy values javascript

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//check falsy value using Boolean()
//if it falsy it return false

let falsyValue = [0, "", NaN, undefined, false, null, -0, 022, 100, {}, []]

falsyValue.forEach(ele => {
    console.log(Boolean(ele))
})

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Contributed on Jun 05 2022

Outstanding Oystercatcher

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falsy values in javascript

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undefined
null
NaN
0
"" (empty string)
false

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Source: www.freecodecamp.org

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Contributed on Jun 17 2022

Blue Justice

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falsy value javascript

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//false,0,"",undefined,NaN are falsy value and all other value are truthy in js

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Contributed on Jul 27 2022

Shirshak Kandel

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javascript falsy values

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if (true)
if ({})
if ([])
if (42)
if ("0")
if ("false")
if (new Date())
if (-42)
if (12n)
if (3.14)
if (-3.14)
if (Infinity)
if (-Infinity)

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Source: developer.mozilla.org

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Contributed on Jan 30 2021

Embarrassed Eel

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js falsy values

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    let a = false
    let b = 0
    let c = -0
    let d = 0n
    let e = ''
    let f = null
    let g = undefined
    let h = NaN

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Contributed on Jan 16 2021

Surf Kid Bonanza

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falsy values in javascript

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// falsy values in javascript

1) false
2) 0, -0, 0n
3) null
4) undefined
5) NaN
6) "", '', `` // empty string

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Contributed on Jan 19 2022

Inquisitive Iguana

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falsy values in javascript

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