Truthy and Falsy Values:
in Javascript, truthy and falsy values are used to determine whether a value evaluate to true or false in a boolean
context.this concept is crucial for controlling the flow of your program using conditions like if statement.
Falsy Values: 0," ",null,NaN,false,undefined
console.log(Boolean(0)); //false
console.log(Boolean(undefined)); //false
console.log(Boolean(' ')); //empty false
console.log(Boolean(null)); //false
console.log(Boolean(NaN)); //false not a number
console.log(Boolean(false)); //false
Truthy Values: any value that is not Falsy :
console.log(Boolean(1)); //true
console.log(Boolean(1833933)); //true
console.log(Boolean(-1)); //true
console.log(Boolean("hello")); //true
console.log(Boolean(1)); //true
console.log(Boolean([])); //true empty array
console.log(Boolean({})); //true empty object
console.log(function (){}); //true
Example:
t f let cash =255 //0 ; //conditions false statement block not run if (cash){ console.log("you can buy burger with drink"); }else{ console.log("you can buy burger"); }else{ console.log("you don't have money"); }
let a; console.log(a); //false
output: undefined
let a = 10; console.log(a); //true
let a = null; console.log(a); //false
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