Boolean data type

Why JAVASCRIPT?

• Why Javascript?

How to write and run Javascript

• Coding with Notepad++
• Coding with VS Code
• Coding in playcode
• Start Coding

How to Add Javascript to Webpage

• How and Where to Add JavaScript to a Web Page

Representing data with values

• Value types
• Variables

Primitive Data Types

• Primitive Data Types
• Number Type
• String Type
• Boolean data type
• Undefined and null
• JavaScript Type Conversions

Operators

• Operators in JavaScript
• Unary Operators
• Binary Operators
• Special Operators
• Combining operators

Expressions

• What is an expression?

Statements

• What are statements?
• Expression Statements
• Compound and Empty Statements
• Declaration Statements
• Conditional statements
• Loop statements
• Jump Statements
• Assignments

Arrays

• What is an array?

Boolean variables store one of two possible values: either true or false. The term Boolean is named after George Boole (1815–1864), who created an algebraic system of logic. Because it’s named after a person, you generally write it with an initial capital letter. Boolean variables are often used for storing the results of comparisons. You can find out the Boolean value of a comparison or convert any value in JavaScript into a Boolean value by using the Boolean() function. 

For example:

var isItGreater = Boolean (3 > 20);
console.log(isItGreater); 
//false

var areTheySame = Boolean ("tiger" === "Tiger");
console.log(areTheySame); 
//false

In JavaScript, the following values always evaluate to a Boolean false value:

• NaN

• undefined

• 0 (numeric value zero)

• -0

• “” (empty string)

• false