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decapitalize javascript Code Snippet in 2022

stringintermediate

Last Updated: 27 November 2022

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'

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