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decapitalize.md

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27 lines (22 loc) · 1.05 KB
title tags author_title author_url author_image_url description image
decapitalize
string,array,intermediate
Deepak Vishwakarma
Implementation of "decapitalize" in typescript, javascript and deno.

JS

Decapitalizes the first letter of a string.

Use array destructuring and String.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 parameter 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'