vector.js

/* Задание:
    Напишите TypeScript типы для этого кода
*/

class Vector {
    constructor(x, y) {
        this.x = x;
        this.y = y;
        this.length = Math.sqrt(x * x + y * y);
        this.angle = Math.atan2(y, x);
    }
    add(vector) {
        return new Vector(this.x + vector.x, this.y + vector.y);
    }
    sub(vector) {
        return new Vector(this.x - vector.x, this.y - vector.y);
    }
    negate() {
        return new Vector(-this.x, -this.y);
    }
    dot(vector) {
        return this.x * vector.x + this.y * vector.y;
    }
}

Vector.zero = new Vector(0, 0);
Vector.up = new Vector(0, 1);
Vector.down = new Vector(0, -1);
Vector.left = new Vector(-1, 0);
Vector.right = new Vector(1, 0);

Vector.equals = function (a, b) {
    return a.x === b.x && a.y === b.y;
}

Vector.isVector = function (obj) {
    return obj instanceof Vector;
}

function createVector(...args) {
    if (args.length === 2) {
        return new Vector(args[0], args[1]);
    }
    if (Array.isArray(args[0])) {
        return new Vector(args[0][0], args[0][1]);
    }
    return new Vector(args[0].x, args[0].y);
}