invertCase

Inverts the case of each character in a string: uppercase becomes lowercase and vice versa.

Syntax

invertCase(str: string): string

Parameters

Parameter	Type	Description
str	string	The string to be processed.

Returns

Type	Description
string	A new string with the case of each character inverted.

Example

invertCase("AbC"); // "aBc"
invertCase("Olá MUNDO!"); // "oLÁ mundo!"
invertCase(""); // ""

Notes

• Throws TypeError if the argument is not a string.
• Non-alphabetic characters remain unchanged.

References

• MDN: String.prototype.toUpperCase()
• MDN: String.prototype.toLowerCase()