String utilities

capitalize.test.js

const capitalize = require('./index');

test('Capitalize is a function', () => {
  expect(typeof capitalize).toEqual('function');
});

test('capitalizes the first letter of every word in a sentence', () => {
  expect(capitalize('hi there, how is it going?')).toEqual(
    'Hi There, How Is It Going?'
  );
});

test('capitalizes the first letter', () => {
  expect(capitalize('i love breakfast at bill miller bbq')).toEqual(
    'I Love Breakfast At Bill Miller Bbq'
  );
});

string_utils.js

// --- Directions
// Write a function that accepts a string.  The function should
// capitalize the first letter of each word in the string then
// return the capitalized string.
// --- Examples
//   capitalize('a short sentence') --> 'A Short Sentence'
//   capitalize('a lazy fox') --> 'A Lazy Fox'
//   capitalize('look, it is working!') --> 'Look, It Is Working!'

/**
 * @param {string} str
 * @returns {string} Capitalized string
 */
function capitalize(str) {
	return str.toLowerCase().replace(/^\w|\s\w/g, match => match.toUpperCase());
}

module.exports = capitalize;