"use strict"; function assert(actual, expected, message) {    if (arguments.length == 1)        expected = true;     if (actual === expected)        return;     if (actual !== null && expected !== null    &&  typeof actual == 'object' && typeof expected == 'object'    &&  actual.toString() === expected.toString())        return;     throw Error("assertion failed: got |" + actual + "|" +                ", expected |" + expected + "|" +                (message ? " (" + message + ")" : ""));} /* operators overloading with Operators.create() */function test_operators_create() {    class Vec2    {        constructor(x, y) {            this.x = x;            this.y = y;        }        static mul_scalar(p1, a) {            var r = new Vec2();            r.x = p1.x * a;            r.y = p1.y * a;            return r;        }        toString() {            return "Vec2(" + this.x + "," + this.y + ")";        }    }        Vec2.prototype[Symbol.operatorSet] = Operators.create(    {        "+"(p1, p2) {            var r = new Vec2();            r.x = p1.x + p2.x;            r.y = p1.y + p2.y;            return r;        },        "-"(p1, p2) {            var r = new Vec2();            r.x = p1.x - p2.x;            r.y = p1.y - p2.y;            return r;        },        "=="(a, b) {            return a.x == b.x && a.y == b.y;        },        "<"(a, b) {            var r;            /* lexicographic order */            if (a.x == b.x)                r = (a.y < b.y);            else                r = (a.x < b.x);            return r;        },        "++"(a) {            var r = new Vec2();            r.x = a.x + 1;            r.y = a.y + 1;            return r;        }    },    {        left: Number,        "*"(a, b) {            return Vec2.mul_scalar(b, a);        }    },    {        right: Number,        "*"(a, b) {            return Vec2.mul_scalar(a, b);        }    });     var a = new Vec2(1, 2);    var b = new Vec2(3, 4);    var r;     r = a * 2 + 3 * b;    assert(r.x === 11 && r.y === 16);    assert(a == a, true);    assert(a == b, false);    assert(a != a, false);    assert(a < b, true);    assert(a <= b, true);    assert(b < a, false);    assert(b <= a, false);    assert(a <= a, true);    assert(a >= a, true);    a++;    assert(a.x === 2 && a.y === 3);    r = ++a;    assert(a.x === 3 && a.y === 4);    assert(r === a);} /* operators overloading thru inheritance */function test_operators(){    var Vec2;     function mul_scalar(p1, a) {        var r = new Vec2();        r.x = p1.x * a;        r.y = p1.y * a;        return r;    }     var vec2_ops = Operators({        "+"(p1, p2) {            var r = new Vec2();            r.x = p1.x + p2.x;            r.y = p1.y + p2.y;            return r;        },        "-"(p1, p2) {            var r = new Vec2();            r.x = p1.x - p2.x;            r.y = p1.y - p2.y;            return r;        },        "=="(a, b) {            return a.x == b.x && a.y == b.y;        },        "<"(a, b) {            var r;            /* lexicographic order */            if (a.x == b.x)                r = (a.y < b.y);            else                r = (a.x < b.x);            return r;        },        "++"(a) {            var r = new Vec2();            r.x = a.x + 1;            r.y = a.y + 1;            return r;        }    },    {        left: Number,        "*"(a, b) {            return mul_scalar(b, a);        }    },    {        right: Number,        "*"(a, b) {            return mul_scalar(a, b);        }    });     Vec2 = class Vec2 extends vec2_ops    {        constructor(x, y) {            super();            this.x = x;            this.y = y;        }        toString() {            return "Vec2(" + this.x + "," + this.y + ")";        }    }        var a = new Vec2(1, 2);    var b = new Vec2(3, 4);    var r;     r = a * 2 + 3 * b;    assert(r.x === 11 && r.y === 16);    assert(a == a, true);    assert(a == b, false);    assert(a != a, false);    assert(a < b, true);    assert(a <= b, true);    assert(b < a, false);    assert(b <= a, false);    assert(a <= a, true);    assert(a >= a, true);    a++;    assert(a.x === 2 && a.y === 3);    r = ++a;    assert(a.x === 3 && a.y === 4);    assert(r === a);} function test_default_op(){    assert(Object(1) + 2, 3);    assert(Object(1) + true, 2);    assert(-Object(1), -1);} test_operators_create();test_operators();test_default_op();