showing results for - "falsy values javascript"
Line
19 Apr 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
Edoardo
10 Jan 2017
1// Falsy values:
20
3''
4undefined
5null
6NaN
Calie
30 Jun 2020
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.
Milton
02 Jun 2017
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
Jax
14 Mar 2020
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
Elya
21 Feb 2018
1/*
2	Yes.
3    Full list of falsy values:
4    Anything evaluated to be 0
5    '', "", or ``
6    null
7    undefined
8    NaN
9    Obviously false
10    Big integers relative to 0n
11    -------------------------------------------------------------------------
12    To clarify, line 31 will print false.
13*/
14var someCheckIsTrue = false;
15const checks = [
16  0,
17  '',
18  "",
19  ``,
20  null,
21  undefined,
22  NaN,
23  false,
24  0n
25];
26for (const check of checks) {
27  if (check) {
28    someCheckIsTrue = true;
29  }
30}
31console.log(someCheckIsTrue);
queries leading to this page
what is meant by truthy and falsy value in jsfalsy and truthy values javascriptwhat is considered falsy in javascriptcheck if all values are falsy or truthy jshow to check a value is truthy or falsy in javascript falsy values js6 falsy values javascripttruthy and falsy javascriptjavascript truthy falseyjavascript parameters truthy falsyfalsy is truthy javascriptjs null falseyjavascript does 22 22 evaluate to falsehow to get truthy and falsy javascriptwhat are the falsy values in jshow to specify falsy values in jscan undefined be truthytruthy falsy javascriptjavascript 0 truthyfalsy values javascriptnull as truthy in jsfalsy values javascriptwhat is truthy and falsy in javascriptusing falsy in javascriptwhat are truthy and falsy values in javascriptjs false valueslist of falsy values in jshow to ignore falsy on or in jstruthy and falsy js tablejavascript falsyis null falsy in jsfalsy values in js js or truthyempty string is a falsy valuefalsy values jsvalue 3d 3dfalse javascriptfalsy values javascriptfalsy values javascriptfalsy and truthy value javascriptjs falsy valuesis null falsy value in javascripttruthy values javascriptjs falsy name for objecttruthy and falsy in javascripttruthy and falsy trong jstruthy and falsy in javascript divisible by 7 falsy in javascriptfalsy values javascriptjavascript falsy argumentjs undefined falseyfalsy values javascriptjavascript using falsyfalsy truthy javascriptjs undefined falsyis null falsyfalsy values javascriptfalse a falsey value javascriptis 0 truthy or falsy in javascripttruthy and falsy values javascripttruthy values jstruthy falsy trong javascriptfalsy values javascriptfalsy values javascriptjs truthy or falsy detectis nan falsy javascriptstring but falsy falsy javascripttruthy stringwhat are js falsy valuesis undefined a falsy valuefalsy values javascriptfalsy string jswhich value is falsy javascripttruthy and falsy in jsjavascript truthy and falsy values listwhat is falsy values in javascriptis null a falsy value javascriptfalsy values javascriptall possible falsy values in jsjavascript check for falsywhat is falsy value in javascripttruthy valuew in jstruthy and falsy values objects javascriptjavascript falsy truthybest way to check for truthy or falsy in javascriptreturn truthy or falsy javascripttruthy falsy values javascriptfunction falsy javascriptfalse javascript valuesis null falsy javascripttruthy and falsy 3a when all is not equal in javascriptfalsy value example javascriptwhich value is falsy in js 3fjavascript 1 falsyfalsy values javascript 1 falsy value in javascriptundefined is falsyfalsty values in javascriptfalsy values javascript 0falsy values javascriptjs truthy falsymake a truthy values falsy in javascriptfalsy values javascriptjs falsy valuejavascript 22 22 is falsyfalsy values javascriptjavascript is truthy functioncheck truthy value javascriptjavascript truthy falsypromisenodata will return falsy 2ctruth value empty string jstruthy and falsy value in javascriptjavascript library for truthyempty string falsey javascriptjavascript truthy or falsy operatorcheck falsy values javascriptfalsy values javascriptall falsy values in jsjavsacript falsy valuesjs truthy value syntaxfalsy value javascriptfalsy values javascriptwhat are the falsy values of javascriptjs is false falseyjavascript truthy and falsy0 truthy or falsy javascriptfalsy in javascript pronounciationfalse values javascriptwhat is truthty and falsy values in javascriptfalsy values javascriptwhat values does javascript consider 27falsy 27 3fall falsy values javascriptwhat is the use of truthy and falsy values in javascriptjs falsy valuesfalsy values javascripttruthy value javascriptjs null falsyare numbers truthy in jsjavascript falsy valuedfalse values and truthy values in jsjs truthy valueswhat is falsy in javascriptwhat values are falsy in javascriptfalsy values javascriptfalsy javascriptnull is falsy 3fjavascript is null truthytruthy falsy jsjs which values are falsyfalsy and truthy values in javascriptfalsy in javascriptfalsy values javascriptare strings truthy javascripttruthy vs falsey javascriptjavascript how to return truthy and falsy valuesjs falsey valuestruthy value and falsy values in jswhich is falsy value in jsfalsy values javascript5 falsy values jstruthy value in javascriptfalsy jsfalsy values javascriptfalsy values in javascriptjavascript what is falsyfalsy values js numberfalsy values javascriptwhat are the falsy values in javascriptjavascript falsy valuesall falsy value jsfalsy value jsfalsy values javascripttruthy value in jsis falsy javascriptfind javascript falsy valuesfalsy values javascriptdoes value evaluate to false javascriptfalsey values in javascriptfalsy value in jshow to convert value into truthy or falsy jsfalsy values javascriptfalsey values in javascriottruthy falsy in jsfalsey values jsfalsy values javascriptfalsy values jsis undefined falsy in javascriptwhat are falsy values in jsjs truthy valuejavascript 5 falsy valuesfalsy in jsfalsy values javascriptwhat are falsy values in javascript 3ftruthy or falsy javascriptjavascript beutifiesfalsy value in javascriptfalsy values javascriptjavascript truthy vs falsyis 22 22 falsy javascriptfalsy values javascriptsix falsy javascriptwhat are falasy values in jswhat is false in javascriptjavascript truthy valuewhat is truthy and falsy values in javascriptfalsy values javascriptfalsey javascripttruthy and falsy values in javascriptwhat does falsy mean in javascriptjs falsy falsy in jsfalsey 0n jstruthy values in javascriptfalsy 1 javascriptjavascript truthy valuesfalsey values in jsvalues that are falsy jsjs check faly or 0which one is a falsy value in javascripthow to check falsy value in javascriptwhich value is falsy 3f jstruthy values and falsy values in jsfalsy values javascript 0nfalsy values javascript 1 is falsy in jstruthy numbers in javascriptjavascript truthy and falseyfalsy values javascriptwhat are falsy values in javascriptfalsy values in jsfalse values in javascripthow to represent falsy value in javascriptjs falsuy valuesjavascript truthy and falsy valuestruthy vs falsy javascriptfalsy values javascript