Uppercase the first character of each word in a string

JavaScript version

const uppercaseWords = (str) => str
  .split(' ')
  .map((w) => `${w.charAt(0).toUpperCase()}${w.slice(1)}`)
  .join(' ')

// Or
const uppercaseWords = (str) => str.replace(/^(.)|\s+(.)/g, (c) => c.toUpperCase())

Examples

uppercaseWords('hello world') // 'Hello World'