Boolean is a datatype that returns either of two values i.e. true or false. In JavaScript, Boolean is used as a function to get the value of a variable, object, conditions, expressions, etc. in terms of true or false. Show Note: A variable or object which has a value is treated as a true boolean value. ‘0’, ‘NaN’, empty string, ‘undefined’, and ‘null’ is treated as false boolean values. Here a1 and a2 store the boolean value i.e. true and false respectively. var a1 = true; var a2 = false; Note: Below variables are initialized with strings not boolean values. var a1 ="true"; var a2 ="false"; Boolean() function in JavaScript: Boolean function returns the boolean value of the variable. It can also be used to find the boolean result of a condition, expression, etc. Syntax: Boolean(variable/expression) JavaScript Boolean object: The boolean object in javascript is an object wrapper for boolean values. Booleans in JavaScript can also be defined using the new keyword. Syntax: new Boolean(value) Below are examples of the JavaScript Boolean method. Example 1: Below program will give true values as output javascript
var a1 ="true"; var a2 ="false";0 var a1 ="true"; var a2 ="false";1 var a1 ="true"; var a2 ="false";2 var a1 ="true"; var a2 ="false";3 var a1 ="true"; var a2 ="false";4 Output: true Example 2: Javascriptvar a1 ="true"; var a2 ="false";5 var a1 ="true"; var a2 ="false";6 var a1 ="true"; var a2 ="false";7 var a1 ="true"; var a2 ="false";5 var a1 ="true"; var a2 ="false";9 Boolean(variable/expression)0 Boolean(variable/expression)1 Boolean(variable/expression)2 Boolean(variable/expression)3 var a1 ="true"; var a2 ="false";5 Boolean(variable/expression)5 Boolean(variable/expression)6 var a1 ="true"; var a2 ="false";5 Boolean(variable/expression)8 Boolean(variable/expression)9 var a1 ="true"; var a2 ="false";5 new Boolean(value)1 Boolean(variable/expression)1 new Boolean(value)3 Boolean(variable/expression)3 var a1 ="true"; var a2 ="false";5 new Boolean(value)6 Boolean(variable/expression)1 new Boolean(value)8 Boolean(variable/expression)3 var a1 ="true"; var a2 ="false";5 true1 Boolean(variable/expression)0 true3 var a1 ="true"; var a2 ="false";5 true5 true6 Output: Boolean(10) is true Boolean("GeeksforGeeks") is true Boolean(2.74) is true Boolean(-1) is true Boolean('true') is true Boolean('false') is true Boolean(3 * 2 + 1.11) is true Boolean(1<2) is true Example 3: Below program will give false values as output. javascripttrue7 true8 true9 var a1 ="true"; var a2 ="false";5 Boolean(10) is true Boolean("GeeksforGeeks") is true Boolean(2.74) is true Boolean(-1) is true Boolean('true') is true Boolean('false') is true Boolean(3 * 2 + 1.11) is true Boolean(1<2) is true1 Boolean(10) is true Boolean("GeeksforGeeks") is true Boolean(2.74) is true Boolean(-1) is true Boolean('true') is true Boolean('false') is true Boolean(3 * 2 + 1.11) is true Boolean(1<2) is true2 var a1 ="true"; var a2 ="false";5 Boolean(10) is true Boolean("GeeksforGeeks") is true Boolean(2.74) is true Boolean(-1) is true Boolean('true') is true Boolean('false') is true Boolean(3 * 2 + 1.11) is true Boolean(1<2) is true4 Boolean(variable/expression)1 Boolean(10) is true Boolean("GeeksforGeeks") is true Boolean(2.74) is true Boolean(-1) is true Boolean('true') is true Boolean('false') is true Boolean(3 * 2 + 1.11) is true Boolean(1<2) is true6 Boolean(variable/expression)3 var a1 ="true"; var a2 ="false";5 Boolean(10) is true Boolean("GeeksforGeeks") is true Boolean(2.74) is true Boolean(-1) is true Boolean('true') is true Boolean('false') is true Boolean(3 * 2 + 1.11) is true Boolean(1<2) is true9 Boolean(variable/expression)0 Boolean(0) is false Boolean("") is false Boolean(e) undefined is false Boolean(-0) is false Boolean(false) is false Boolean(NaN) is false Boolean(null) is false Boolean(1>2) is false1 var a1 ="true"; var a2 ="false";5 Boolean(0) is false Boolean("") is false Boolean(e) undefined is false Boolean(-0) is false Boolean(false) is false Boolean(NaN) is false Boolean(null) is false Boolean(1>2) is false3 Boolean(0) is false Boolean("") is false Boolean(e) undefined is false Boolean(-0) is false Boolean(false) is false Boolean(NaN) is false Boolean(null) is false Boolean(1>2) is false4 var a1 ="true"; var a2 ="false";5 Boolean(0) is false Boolean("") is false Boolean(e) undefined is false Boolean(-0) is false Boolean(false) is false Boolean(NaN) is false Boolean(null) is false Boolean(1>2) is false6 Boolean(variable/expression)1 Boolean(0) is false Boolean("") is false Boolean(e) undefined is false Boolean(-0) is false Boolean(false) is false Boolean(NaN) is false Boolean(null) is false Boolean(1>2) is false8 Boolean(variable/expression)3 var a1 ="true"; var a2 ="false";5 v1 = false v2 = false v3 = false v4 = false v5 = true v6 = true1 v1 = false v2 = false v3 = false v4 = false v5 = true v6 = true2 var a1 ="true"; var a2 ="false";5 v1 = false v2 = false v3 = false v4 = false v5 = true v6 = true4 Boolean(variable/expression)1 v1 = false v2 = false v3 = false v4 = false v5 = true v6 = true6 Boolean(variable/expression)3 var a1 ="true"; var a2 ="false";5 v1 = false v2 = false v3 = false v4 = false v5 = true v6 = true9 v1 = = v2 is true v1 = = = v2 is false0 Output: Boolean(0) is false Boolean("") is false Boolean(e) undefined is false Boolean(-0) is false Boolean(false) is false Boolean(NaN) is false Boolean(null) is false Boolean(1>2) is false Example 4: javascripttrue7 v1 = = v2 is true v1 = = = v2 is false2 Boolean(0) is false Boolean("") is false Boolean(e) undefined is false Boolean(-0) is false Boolean(false) is false Boolean(NaN) is false Boolean(null) is false Boolean(1>2) is false8 v1 = = v2 is true v1 = = = v2 is false4 true7 v1 = = v2 is true v1 = = = v2 is false6 v1 = = v2 is true v1 = = = v2 is false7 v1 = = v2 is true v1 = = = v2 is false8 Boolean(0) is false Boolean("") is false Boolean(e) undefined is false Boolean(-0) is false Boolean(false) is false Boolean(NaN) is false Boolean(null) is false Boolean(1>2) is false8 function 0true7 function 2v1 = = v2 is true v1 = = = v2 is false7 v1 = = v2 is true v1 = = = v2 is false8 Boolean(10) is true Boolean("GeeksforGeeks") is true Boolean(2.74) is true Boolean(-1) is true Boolean('true') is true Boolean('false') is true Boolean(3 * 2 + 1.11) is true Boolean(1<2) is true6 function 0true7 function 8v1 = = v2 is true v1 = = = v2 is false7 var a1 ="true"; var a2 ="false";00 true7 var a1 ="true"; var a2 ="false";02 v1 = = v2 is true v1 = = = v2 is false7 v1 = = v2 is true v1 = = = v2 is false8 var a1 ="true"; var a2 ="false";05 function 0true7 var a1 ="true"; var a2 ="false";08 v1 = = v2 is true v1 = = = v2 is false7 v1 = = v2 is true v1 = = = v2 is false8 Boolean(variable/expression)2 function 0var a1 ="true"; var a2 ="false";13 var a1 ="true"; var a2 ="false";14 var a1 ="true"; var a2 ="false";15 var a1 ="true"; var a2 ="false";13 var a1 ="true"; var a2 ="false";17 var a1 ="true"; var a2 ="false";18 var a1 ="true"; var a2 ="false";13 var a1 ="true"; var a2 ="false";20 var a1 ="true"; var a2 ="false";21 var a1 ="true"; var a2 ="false";13 var a1 ="true"; var a2 ="false";23 var a1 ="true"; var a2 ="false";24 var a1 ="true"; var a2 ="false";13 var a1 ="true"; var a2 ="false";26 var a1 ="true"; var a2 ="false";27 var a1 ="true"; var a2 ="false";13 var a1 ="true"; var a2 ="false";29 var a1 ="true"; var a2 ="false";30 Output: v1 = false v2 = false v3 = false v4 = false v5 = true v6 = true Example 5: javascripttrue7 v1 = = v2 is true v1 = = = v2 is false2 var a1 ="true"; var a2 ="false";05 v1 = = v2 is true v1 = = = v2 is false4 true7 v1 = = v2 is true v1 = = = v2 is false6 v1 = = v2 is true v1 = = = v2 is false7 v1 = = v2 is true v1 = = = v2 is false8 var a1 ="true"; var a2 ="false";05 function 0var a1 ="true"; var a2 ="false";41 var a1 ="true"; var a2 ="false";5 var a1 ="true"; var a2 ="false";43 var a1 ="true"; var a2 ="false";44 var a1 ="true"; var a2 ="false";5 var a1 ="true"; var a2 ="false";46 var a1 ="true"; var a2 ="false";47 Output: v1 = = v2 is true v1 = = = v2 is false Note: v1 = = = v2 is not true as the type of v1 and v2(object) is not the same. Supported Browsers:
We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript. Apa itu Boolean JavaScript?Pengertian Tipe Data Boolean dalam JavaScript
Tipe data Boolean adalah tipe data yang hanya mempunyai dua nilai, yakni benar (True) atau salah (False). Tipe data boolean sering digunakan untuk membuat alur logika program.
Bagaimana mendeklarasikan variabel JavaScript?Cara membuat variabel yang umum digunakan di javascript adalah menggunakan kata kunci var lalu diikuti dengan nama variabel dan nilainya. Contoh: var title = "Belajar Pemrograman Javascript"; Pada contoh di atas, kita membuat variabel bernama title dengan nilai berupa teks (string): "Belajar Pemrograman Javascript" .
Apa itu VAR dalam JavaScript?Variable adalah temporal data yang disimpan dalam sebuah memory komputer. Oleh karenanya, ketika kita menentukkan nama sebuah variable dan menyimpan nilai (data) dalam variabel tersebut, kita pun bisa merubah datanya dengan data lain sesuai keinginan dalam waktu yang berbeda.
Apa yang dimaksud dengan tipe data Boolean adalah?Boolean adalah jenis tipe data selanjutnya yang perlu kamu kuasai sebelum terjun ke dunia pemrograman. Jenis data type ini biasanya digunakan untuk mewakili nilai yang benar dan salah dalam data. Umumnya, nilai yang salah (false) dan benar (true) direpresentasikan dengan angka 0 (false) dan 1 (true).
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