Learning JavaScript Type Coercion

Learning JavaScript Type Coercion

You need to understand how JavaScript type conversion works to avoid potential bugs in your code. Type coercion in JavaScript is a process where a value of one type is implicitly converted into another type. This is automatically done by JavaScript so that your code won’t hit any errors. But as you’ll see in this post, type coercion can actually be the cause for bugs.

You need to understand how JavaScript type conversion works to avoid potential bugs in your code.

Type coercion in JavaScript is a process where a value of one type is implicitly converted into another type. This is automatically done by JavaScript so that your code won’t hit any errors. But as you’ll see in this post, type coercion can actually be the cause for bugs.

To understand type coercion well, you need to learn about the type system in general, so we’ll start with that.

What is a type system?

A type system is a set of logical rules that assigns a type (or data type) into various constructs of a computer program. You can read a lot about type system in other websites, but suffice to say that the JavaScript type system is the reason why it knows that "1" is a string and 1 is a number:

In the following example, the type system will identify the right data types for each variable accordingly:

let myNumber = 1; // a number
let myString = "1"; // a string

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