Calculate the angle of a line defined by two points

JavaScript

// In radians
const radiansAngle = (p1, p2) => Math.atan2(p2.y - p1.y, p2.x - p1.x

// In degrees
const degreesAngle = (p1, p2) => (Math.atan2(p2.y - p1.y, p2.x - p1.x) * 180) / Math.PI

TypeScript

interface Point {
  x: number
  y: number
}

const radiansAngle = (p1: Point, p2: Point): number => Math.atan2(p2.y - p1.y, p2.x - p1.x)

const degreesAngle = (p1: Point, p2: Point): number => (Math.atan2(p2.y - p1.y, p2.x - p1.x) * 180) / Math.PI