Convert bearing (0-360 degrees) to cardinal direction (N, NW, etc...)

cardinalDirection.js

//divide 360 into 16 equal slices
const degrees = (new Array(16)).fill(null).map((x, i) => 360/16 * i + 11.25);
const directions = ['N', 'NNE', 'NE', 'ENE', 'E', 'ESE', 'SE', 'SSE', 'S', 'SSW', 'SW', 'WSW', 'W', 'WNW', 'NW', 'NNW'];

function cardinalDirection(bearing) {
  for (let i = 0, l = degrees.length; i < l; i++) {
    if (bearing < degrees[i]) return directions[i];
    if (i == l - 1) return directions[0];
  }
}