#1232 - Check If It Is a Straight Line

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Problem Description

You are given an array `coordinates`, `coordinates[i] = [x, y]`, where `[x, y] represents the coordinate of a point.

Check if these points make a straight line in the XY plane.

Solution

/**
 * @param {number[][]} coordinates
 * @return {boolean}
 */
var checkStraightLine = function(coords) {
  const m = (coords[0][1] - coords[1][1]) / (coords[0][0] - coords[1][0]);
  const b = coords[0][1] - m * coords[0][0];

  return coords.every(coord => coord[1] === m * coord[0] + b);
};