capitalize.md

title	tags	author_title	author_url	author_image_url	description	image
capitalize	string array intermediate	Deepak Vishwakarma	https://github.com/deepakshrma	https://avatars2.githubusercontent.com/u/7682731?s=400	Implementation of "capitalize" in typescript, javascript and deno.	https://www.positronx.io/wp-content/uploads/2018/11/positronx-banner-1152-1.jpg

Capitalizes the first letter of a string.

Use array destructuring and String.prototype.toUpperCase() to capitalize first letter, ...rest to get array of characters after first letter and then Array.prototype.join('') to make it a string again. Omit the lowerRest parameter to keep the rest of the string intact, or set it to true to convert to lowercase.

const capitalize = (str: string = "", lowerRest = false): string =>
  str.slice(0, 1).toUpperCase() +
  (lowerRest ? str.slice(1).toLowerCase() : str.slice(1));

capitalize("fooBar"); // 'FooBar'
capitalize("fooBar", true); // 'Foobar'