Decapitalize string

OSCC · JavaScript, String · Nov 1, 2020

Decapitalizes the first letter of a string.

  • Use array destructuring and String.prototype.toLowerCase() to decapitalize first letter, ...rest to get array of characters after first letter and then Array.prototype.join() to make it a string again.
  • Omit the upperRest argument to keep the rest of the string intact, or set it to true to convert to uppercase.
const decapitalize = ([first, ...rest], upperRest = false) =>
  first.toLowerCase() +
  (upperRest ? rest.join('').toUpperCase() : rest.join(''));
decapitalize('FooBar'); // 'fooBar'
decapitalize('FooBar', true); // 'fOOBAR'

Recommended snippets

  • Capitalize string

    JavaScript, String

    Capitalizes the first letter of a string.

  • Capitalize every word

    JavaScript, String

    Capitalizes the first letter of every word in a string.

  • CSV to JSON

    JavaScript, String

    Converts a comma-separated values (CSV) string to a 2D array of objects. The first row of the string is used as the title row.