JavaScript Standard Objects: Strings

Surely you've heard that, in JavaScript, everything is an object. Strings, numbers, functions, arrays, and, well, objects, are considered objects.

In this tutorial we'll take a deep dive into the String "global" or "standard built-in" object, along with the methods associated with it.

String.prototype.toUpperCase()

The JavaScript method String.toUpperCase() returns the same string it was called on, but in all uppercase characters.

Syntax

str.toUpperCase()

Examples

console.log("hello world".toUpperCase()); // "HELLO WORLD"

String.prototype.fromCharCode()

The String.fromCharCode() method returns a string created by using the specified sequence of Unicode values.

Syntax

String.fromCharCode(num1, num2...)

Parameters

A sequence of numbers that represent Unicode values.

Examples

String.fromCharCode(65, 66, 67);  // "ABC"

var test = String.fromCharCode(112, 108, 97, 105, 110);
document.write(test);

// Output: plain