JavaScript 2D Vector Class

Vector2D.js

/*

Simple 2D JavaScript Vector Class

Sujin Lee

*/

class Vector {
    constructor(v, w) {
        this.v = v
        this.w = w

        this.decimalPlaces = 2
        this.sign = {
            add : '+',
            subtract: '-',
            multiply: '*',
            division:'/'
        }
    }

    exec(sign) {
        this.convertSinCos()
        return this.v.map((e, i) => this.round(eval(e + sign + this.w[i])));
    }

    //add vectors
    add() {
        return this.exec(this.sign.add)
    }

    //subtract vectors
    sub() {
        return this.exec(this.sign.substract)
    }

    //scale the vector with multiplication
    mult() {
        return this.exec(this.sign.multiply)
    }
    // scale the vector with division
    div() {
        return this.exec(this.sign.division)
    }

    // calculate the magnitude of a vector
    mag() {

    }

    // normalize the vector to a unit length of 1
    normalize() {

    }

    // limit the magnitude of a vector()
    limit() {

    }

    // the 2D heading of a vector expressed as an angle
    heading2D() {

    }

    // the Euclidean distance between two vectors (considered as points)
    dist() {

    }

    // find the angle between two vectors
    angleBetween() {

    }

    // the dot product of two vectors
    dot() {

    }

    // the cross product of two vectors (only relevant in three dimensions)
    cross(){

    }

    unit() {
        const v1 = this.v[0]
        const v2 = this.v[1]
        const base = 1/Math.sqrt(Math.pow(v1, 2)+Math.pow(v2, 2))
        return [base*v1, base*v2]
    }

    convertSinCos() {
        const vectors = [this.v, this.w]
        for (let vector of vectors) {
            const isDeg = typeof(vector[1])=== 'string' &&  vector[1].includes("deg")
            if (isDeg) {
                const magnitude = vector[0]
                const dirAngle = vector[1].match(/\d+/g) * (Math.PI / 180);
                vector[0] = magnitude * Math.cos(dirAngle)
                vector[1] = magnitude * Math.sin(dirAngle)
            }
        }
        this.v = vectors[0]
        this.w = vectors[1]
        return this
    }

    round(number) {
        const precision = this.decimalPlaces
        let pair = (number + 'e').split('e')
        let value = Math.round(pair[0] + 'e' + (+pair[1] + precision))
        pair = (value + 'e').split('e')
        return +(pair[0] + 'e' + (+pair[1] - precision))
    }
}

const Test1 = new Vector([8, '290deg'], [6, '60deg'])
console.log(Test1.add()) //[ 5.74, -2.32 ]