Javascript a c#

/* Math (c) Kraft, MIT License */
/**
 * Math (c) Kraft
 */
/**
 * type checking
 */
/**
 * one way to improve these input finders is to search in all indices
 * of the arguments list, right now it assumes THIS is the only thing
 * you're passing in. in the case that it isn't and there's an object
 * in the first slot, it won't find the valid data in the second.
 */
/**
 * @description get the type of an object, which includes the custom types in this library.
 * @param {any} any object
 * @returns {string} the type name
 * @linkcode Math ./src/types/typeof.js 17
 */
const typeOf = function (obj) {
    switch (obj.constructor.name) {
    case "vector":
    case "matrix":
    case "segment":
    case "ray":
    case "line":
    case "circle":
    case "ellipse":
    case "rect":
    case "polygon": return obj.constructor.name;
    }
    if (typeof obj === "object") {
        if (obj.radius != null) { return "circle"; }
        if (obj.width != null) { return "rect"; }
        if (obj.x != null || typeof obj[0] === "number") { return "vector"; }
        // line ray segment
        if (obj[0] != null && obj[0].length && (typeof obj[0].x === "number" || typeof obj[0][0] === "number")) { return "segment"; }
        if (obj.vector != null && obj.origin != null) { return "line"; } // or ray
    }
    return undefined;
};