isLowerCase

Checks if a string contains at least one lowercase letter and no uppercase letters.

Syntax

isLowerCase(str: string): boolean

Parameters

Parameter	Type	Description
str	string	The string to be checked.

Returns

Type	Description
boolean	true if the string contains at least one lowercase letter and no uppercase letters, otherwise false.

Example

isLowerCase("abc"); // true
isLowerCase("Abc"); // false
isLowerCase("123"); // false
isLowerCase(""); // false

Notes

• Throws TypeError if the argument is not a string.
• Spaces are ignored in the check.

References

• MDN: Regular Expressions