format-time.js

// This is the latest solution to the problem from the prep.
// Make sure to do the prep before you do the coursework
// Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.

function formatAs12HourClock(time) {
  const hours = Number(time.slice(0, 2));
  const minutes = time.slice(-2);
  const ampm = hours >= 12 ? "pm" : "am";
  const hour = String(hours % 12 === 0 ? 12 : hours % 12).padStart(2, "0")
  return `${hour}:${minutes} ${ampm}`;
}



const currentOutput = formatAs12HourClock("08:30");
const targetOutput = "08:30 am";
console.assert(
  currentOutput === targetOutput,
  `current output: ${currentOutput}, target output: ${targetOutput}`
);

const currentOutput2 = formatAs12HourClock("23:00");
const targetOutput2 = "11:00 pm";
console.assert(
  currentOutput2 === targetOutput2,
  `current output: ${currentOutput2}, target output: ${targetOutput2}`

);
const currentOutput3 = formatAs12HourClock("00:00");
const targetOutput3 = "12:00 am";
console.assert(
  currentOutput3 === targetOutput3,
  `current output: ${currentOutput2}, target output: ${targetOutput2}`
);
const currentOutput4 = formatAs12HourClock("12:00");
const targetOutput4 = "12:00 pm";
console.assert(
  currentOutput4 === targetOutput4,
  `current output: ${currentOutput2}, target output: ${targetOutput2}`
);