All files / string uncapitalize.ts

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
 
 
 
 
 
 
 
 
 
 
5x
5x
1x
 
4x
4x
 
 
/**
 * Lower-cases the first character of a string and leaves the rest unchanged: the reverse of `capitalize`.
 *
 * @param input - The string.
 * @returns The string with its first character in lower case.
 * @example
 * uncapitalize('RingBuffer'); // 'ringBuffer'
 * uncapitalize('Élan'); // 'élan'
 */
export function uncapitalize(input: string): string {
  const first = input.codePointAt(0);
  if (first === undefined) {
    return input;
  }
  const firstCharacter = String.fromCodePoint(first);
  return firstCharacter.toLowerCase() + input.slice(firstCharacter.length);
}