how to set a variable in javascript

To set a variable in JavaScript, use the var keyword followed by the variable name and the value you want to assign to it. Here's an example:

index.tsx
var num = 10;
var str = "Hello, world!";
var bool = true;
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In this example, num is assigned the value 10, str is assigned the value "Hello, world!", and bool is assigned the value true. Note that JavaScript is a dynamically-typed language, which means that you don't have to specify the type of a variable when you declare it.