JAVASCRIPT

Capitalize The String

const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1)

capitalize("follow for more")
// Result: Follow for more

Capitalize a String

const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1)

capitalize("javascript one-liners are fun")
//Javascript one-liners are fun

capitalize words in a string

/**
 * Capitalizes first letters of words in string.
 * @param {string} str String to be modified
 * @param {boolean=false} lower Whether all other letters should be lowercased
 * @return {string}
 * @usage
 *   capitalize('fix this string');     // -> 'Fix This String'
 *   capitalize('javaSCrIPT');          // -> 'JavaSCrIPT'
 *   capitalize('javaSCrIPT', true);    // -> 'Javascript'
 */
const capitalize = (str, lower = false) =>
  (lower ? str.toLowerCase() : str).replace(/(?:^|s|["'([{])+S/g, match => match.toUpperCase());
;