javascript falsy values

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showing results for - "javascript falsy values"
Yannik
07 Jan 2019
1the number 0
2the BigInt 0n
3the keyword null
4the keyword undefined
5the boolean false
6the number NaN
7the empty string "" (equivalent to '' or ``)
source
Vincenzo
14 Apr 2016
1// Falsy values:
20
3''
4undefined
5null
6NaN
source
Emily
12 Mar 2017
1// JS Essentials: Falsy Values
2
3false
4undefined
5null
6NaN
70 or +0 or -0
8"" or '' or `` (empty string)
9
10// Everything else is truthy
source
Rusty
10 Jul 2019
1false		//The keyword false.
20			//The Number zero (so, also 0.0, etc., and 0x0).
3-0			//The Number negative zero (so, also -0.0, etc., and -0x0).
40n, -0n		//The BigInt zero and negative zero (so, also 0x0n/-0x0n).
5"", '', ``	//Empty string value.
6null		//the absence of any value.
7undefined	//the primitive value.
8NaN			//not a number.
9
10document.all	
11//Objects are falsy if and only if they have the [[IsHTMLDDA]] internal slot.
12//That slot only exists in document.all and cannot be set using JavaScript.
Nico
06 Jan 2021
1    let a = false
2    let b = 0
3    let c = -0
4    let d = 0n
5    let e = ''
6    let f = null
7    let g = undefined
8    let h = NaN
Karl
21 Feb 2017
1if (true)
2if ({})
3if ([])
4if (42)
5if ("0")
6if ("false")
7if (new Date())
8if (-42)
9if (12n)
10if (3.14)
11if (-3.14)
12if (Infinity)
13if (-Infinity)
14
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