memo: Truthy values and falsy values in JavaScript

truthyAndFalsy_JS.md

memo: Truthy values and falsy values in JavaScript

Truthy values

Value	Boolean value	Example
true	true	!!(true); //true
1	true	!!(1); //true
-1	true	!!(-1); //true
3.14	true	!!(3.14); //true
-3.14	true	!!(-3.14); //true
12n	true	!!(12n); //true
Infinity	true	!!(Infinity); //true
-Infinity	true	!!(-Infinity); //true
"0"	true	!!("0"); //true
---	---	---
{}	true	!!({}); //true
{a:1,b:2,b:3}	true	!!({a:1,b:2,b:3}); //true
[]	true	!!([]); //true
[1,2,3]	true	!!([1,2,3]); //true
"false"	true	!!("false"); //true
---	---	---
function(){}	true	!!(function(){}); //true
()=>{}	true	!!(()=>{}); //true

Falsy values

Value	Boolean value	Example
false	false	!!(false); //false
0	false	!!(0); //false
-0	false	!!(-0); //false
0n	false	!!(0n); //false
-0n	false	!!(-0n); //false
---	---	---
Empty string ("")	false	!!(""); //false
null	false	!!(null); //false
undefined	false	!!(undefined); //false
NaN	false	!!(NaN); //false
document.all	false	!!(document.all); //false
---	---	---
function(){}()	false	!!(function(){}()); //false