javascript bool
let isGoodGrepper = true;
JavaScript Boolean
const dataChecked = true; const valueCounted = false;
js Boolean()
// falsy values: false, 0, -0, 0n, null, undefined, NaN, and the empty string "" console.log(Boolean(false)) // false console.log(Boolean(0)) // false console.log(Boolean(-0)) // false console.log(Boolean(0n)) // false console.log(Boolean(null)) // false console.log(Boolean(undefined)) // false console.log(Boolean(NaN)) // false console.log(Boolean("")) // false console.log(typeof Boolean("")) // boolean // truthy values: true, 1, -1, 1n, -1n, Infinity, -Infinity, " ", {}, [] console.log(Boolean(true)) // true console.log(Boolean(1)) // true console.log(Boolean(-1)) // true console.log(Boolean(1n)) // true console.log(Boolean(-1n)) // true console.log(Boolean(Infinity)) // true console.log(Boolean(-Infinity)) // true console.log(Boolean(" ")) // true console.log(Boolean({})) // true console.log(Boolean([])) // true console.log(typeof Boolean([])) // boolean
Source: javascript.plainenglish.io
js value to boolean
const message = ''; console.log(!! message) // false
JavaScript Booleans
let myTrueBool = true; let myFalseBool = false;