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In JavaScript, the value contained inside a variable can be any JavaScript data type, including a number, string, or object. A piece of information that we might reference multiple times can be stored in a variable for later use or modification. Understanding VariablesĪ variable is a named container used for storing values. We will also review the effects of hoisting and the significance of global and local scope to a variable’s behavior.
Javascript for loop var keyword you dont know js how to#
This tutorial will cover what variables are, how to declare and name them, and also take a closer look at the difference between var, let, and const. In JavaScript, there are three keywords used to declare a variable - var, let, and const - and each one affects how the code will interpret the variable differently.
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There are a number of different properties of variables in JavaScript, as well as several rules which must be followed when naming them. Variables are a fundamental part of many programming languages, and are among the first and most important concepts for novice coders to learn.