Simple 2D Vector Operation Class
/**
Simple 2D Vector Operation calculator Class using Javascript
Blog Post : https://www.sujinlee.me/blog/vector-basics/
*/
class Vector {
constructor(v, w) {
this.u = v
this.w = w
this.decimalPlaces = 2
this.sign = {
add: '+',
subtract: '-'
}
}
// scale vectors
scale(num) {
return this.u.map((e, i) => e * num)
}
// add vectors
add() {
return this.exec(this.sign.add)
}
// subtract vectors
sub() {
return this.exec(this.sign.subtract)
}
// scale the vector with multiplication
mult() {
return this.exec(this.sign.multiply)
}
// calculate sign
exec(sign) {
return this.u.map((e, i) => eval(
e + sign + '(' + this.w[i] + ')'
))
}
// magnitude of a vector
magnitude(v) {
return Math.sqrt(Math.pow(v[0], 2) + Math.pow(v[1], 2))
}
// vector magnitude from initial & terminal points
segmentMagnitude() {
return this.round(this.magnitude(this.sub()))
}
// round N decimal numbers
round(num) {
const precision = this.decimalPlaces
return +(Math.round(num + "e+" + precision) + "e-" + precision);
}
}
// test
const VectorInstance = new Vector([1, 1], [5, 3])
const magVector1 = VectorInstance.segmentMagnitude()
console.log(magVector1) // 4.47
VectorInstance.decimalPlaces = 5
const magVector2 = VectorInstance.segmentMagnitude()
console.log(magVector2) // 4.47214