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 ...

What this means is that in JavaScript, you don’t need to declare a variable type. JavaScript will happily use the same variable for numbers, strings, and objects. (Part of TypeScript’s power ...

Computer variables differ from mathematical variables in that they can store different values at different times. We tell JavaScript to create or declare a variable by putting the keyword var in front ...

Computer variables differ from mathematical variables in that they can store different values at different times. We tell JavaScript to create or declare a variable by putting the keyword var in front ...

In javascrit,if you re-declare a variable, it wouldn't lose it value. Here you can see, in JavaScript the output will be same but in other languages result would be undefined or NaN. Re-declaring a ...