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JavaScript variables are used to hold values or expressions. A variable can have a short name, like x, or a more descriptive name, like carname. Rules for JavaScript variable names:
Learning JavaScript eBook (PDF) Download this eBook for free. Chapters. Chapter 1: Getting started with JavaScript. Chapter 2: .postMessage () and MessageEvent. Chapter 3: AJAX. Chapter 4: Anti-patterns. Chapter 5: Arithmetic (Math) Chapter 6: Arrays.
Variables var, const, let var The most common variable. Can be reassigned but only accessed within a function. Variables defined with var move to the top when code is executed. const Cannot be reassigned and not accessible before they appear within the code. let Similar to const, however, let variable can be reassigned but not re-declared.
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Declaring variables on use - Workaround: Force declarations let myVar = 2*typeoVar + 1; Automatic semicolon insertion - Workaround: Enforce semicolons with checkers
Variable Declarations •In JavaScript, you must declarea variable before you can use it. The declaration establishes the name of the variable and, in most cases, specifies the initial value as well. let name= value; •The most common form of a variable declaration is where nameis an identifier that indicates the name of the
Variables are Containers for Storing Data. JavaScript Variables can be declared in 4 ways: Automatically. Using var. Using let. Using const. In this first example, x, y, and z are undeclared variables. They are automatically declared when first used:
