JS: Boolean (class)
What is the Keyword “Boolean”
Boolean is the value of the property key "Boolean" of the Global Object
.
console.log(globalThis["Boolean"] === Boolean);
Type
Type of Boolean is a function.
console.assert(typeof Boolean === "function");
Parent
Parent of Boolean is Function.prototype.
console.assert(Reflect.getPrototypeOf(Boolean) === Function.prototype);
Purpose
Purpose of Boolean is:
- Implicitly called by JavaScript to convert value to boolean primitive. e.g. in a if-statement.
- Implicitly called by JavaScript to convert boolean primitive to object, so it can use methods such as
toString. - Holds the property key
"prototype". Its value is the parent of all instance of boolean.