Type coercion in JavaScript

Type coercion is the implicit process of converting values from one type to another (such as string to number, object to boolean, and so on).

Coercion in computation

-, *, /, % - Operators that automatically converts to number

2 + true; // 3, because true is converted to 1
2 - false; // 2, because false is converted to 0
2 * "2"; // 4
10 / "2"; // 5

The addition sign is different on all these operators because it will prioritize concatenating strings rather than converting to number.

2 + "2"; // 22
2 - "2"; // 0

Coercion in conditional statements

Type coercion also happens when checking for truthy or falsy values.

let num = 10;

if (num) {
  console.log("num is truthy!");
  // 10 is truthy so this condition will execute.
}

let num = 0;

if (!num) {
  console.log("num is falsy!");
  // 10 is falsy so this condition will execute.
}