13-typeconversion.md

Coercion/Implicit Type conversion/Automatic Type conversion

Type Coercion refers to the process of automatic or implicit conversion of values from one data type to another. This includes conversion from Number to String, String to Number, Boolean to Number etc. when different types of operators are applied to the values.

Manual Type Conversion :

In case the behavior of the implicit conversion is not sure, the constructors of a data type can be used to convert any value to that datatype, like the Number(), String() or Boolean() constructor.

Coercion Example

The Number 10 is converted to string '10' and then '+' concatenates both strings

var x = 10 + "20";
var y = "20" + 10;

The Boolean value true is converted to string 'true' and then '+'concatenates both the strings

var z = true + "10";
console.log(x, y, z); //1020 2010 true10

var w = 10 - "5";
var x = 10 * "5";
var y = 10 / "5";
var z = 10 % "5";

console.log(w, x, y, z); //5 50 2 0

The Boolean value true is converted to number 1 and then operation is performed

var x = true + 2;

The Boolean value false is converted to number 0 and then operation is performed

var y = false + 2;

console.log(x, y); // 3 2

Should output 'true' as string '10' is coerced to number 10

var x = 10 == "10";

Should output 'true', as boolean true is coerced to number 1

var y = true == 1;

Should output 'false' as string 'true' is coerced to NaN which is not equal to 1 of Boolean true

var z = true == "true";

console.log(x, y, z); //true true false

Number to String

let ans = String(10);
console.log(typeof ans); //string

String to Number

ans = Number("10");
console.log(ans); //number

ans = Number("learnjavascript");
console.log(ans); //NaN

Number to Boolean

ans = Boolean(10);
console.log(ans); //true

ans = Boolean(0);
console.log(ans); //false

type conversion

implicit type conversion /automatic type conversion

• for example number se string me conversion string se number me convrsion

let x = "20";
console.log(x / 2);

Explicit type and manual type conversion

let x = "20";
console.log(Number(x) + 20); // //string to number

let y = 10;
console.log(string(y) + 200); //number to string