Nowadays JavaScript has three different keywords to declare a variable — var, let and, const. Each has its own properties and particularities. Let’s start by making a simple comparison table of the ...

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This has a simple format. You declare your variable and have it equal to an object in the form `{ key: value}` ...

In computer science, data is anything that is meaningful to the computer. JavaScript provides eight different data types which are undefined, null, boolean, string, symbol, bigint, number, and object.