習題 3 -- JavaScript 物件導向

[ccckmit]

請寫出一個具有『加、減、內積、負』的向量物件？ (Vector, add, sub, dot, neg)

提示：架構如下：

class Vector {
  constructor(array) {
    this.a = array
  }
  add(y) {
    var r = []
    var x = this
    for (var i=0; i<x.a.length; i++) {
      r[i] = x.a[i]+y.a[i]
    }
    return new Vector(r)
  }
}

var x = new Vector([1,2,3])
var y = new Vector([1,1,1])
console.log('x.add(y)=', x.add(y)) // Vector { a: [ 2, 3, 4 ] }
console.log('x.add(y).add(y).add(x)=', x.add(y).add(y).add(x)) // Vector { a: [ 4, 6, 8 ] }
// x.dot(y) 應該是 6
// x.neg() 應該是 Vector([-1,-2,-3])
// x.sub(y) 應該是 Vector([0,1,2])

[DE45A]

class vector {
    constructor(a){
        this.a=a;
    }
    add(v){
        var r=[];
        var x=this;
        for(var i=0;i<x.a.length;++i)r[i]=x.a[i]+v.a[i];
        return new vector(r);
    }
    sub(v){
        var r=[];
        var x=this;
        for(var i=0;i<x.a.length;++i)r[i]=x.a[i]-v.a[i];
        return new vector(r);
    }
    dot(v){
        var miku=0;
        for(var i=0;i<x.a.length;++i)miku+=x.a[i]*v.a[i];
        return miku;
    }neg(){
        var r=[];
        var x=this;
        for(var i=0;i<x.a.length;++i)r[i]=-1*x.a[i];
        return new vector(r);
    }
}
var x=new vector([1,2,3]);
var nx = x.neg()
var b = x.add(nx)
var t = x.dot(x)
var y=new vector([4,5,6]);
console.log(nx);
console.log(b);
console.log(t);

執行結果

vector { a: [ -1, -2, -3 ] }
vector { a: [ 0, 0, 0 ] }
14

[cynthia1231]

110810527 張芷榕
https://github.com/Akoko95/wp109b/blob/main/homework/03/Vector.js

執行結果

x.add(y)= Vector { a: [ 2, 3, 4 ] }
x.sub(y)= Vector { a: [ 0, 1, 2 ] }
x.dot(x)= 6
x.neg(x)= Vector { a: [ -1, -2, -3 ] }

[OohelloworldoO]

110910539鄭智陽

class Vector{
    constructor(array){
    this.a =array
}
    add(y){
        var r=[]
        var x=this;
        for(var i=0;i<x.a.length;i++){
          r[i]=x.a[i]+y.a[i]
        }
     return new Vector(r)
    }
    sub(y){
        var r=[]
        var x=this;
        for(var i =0;i<x.a.length;i++){
            r[i]=x.a[i]-y.a[i]
        }
        return new Vector(r)
    }
    dot(y){
        var r=[]
        var x=this;
        var g=0;
        for(var i =0;i<x.a.length;i++){
            r[i]=x.a[i]*y.a[i]
            g+=r[i]
        }
        return g
    }
    neg(y){
        var r=[]
        var x=this;
        for(var i =0;i<x.a.length;i++){
            r[i]=-x.a[i]
        }
        return new Vector(r)

    }
}
var x=new Vector([1,2,3])
var y=new Vector([1,1,1])
console.log("x.add(y)=",x.add(y))
console.log("x.sub(y)=",x.sub(y))
console.log("x.dot(y)",x.dot(y))
console.log("x.neg=",x.neg(y))

執行結果

x.add(y)= Vector { a: [ 2, 3, 4 ] }
x.sub(y)= Vector { a: [ 0, 1, 2 ] }
x.dot(y) 6
x.neg= Vector { a: [ -1, -2, -3 ] }

[feliciachou]

資工一 110910549 周佳蒨

[jenny126]

資工一 110910516 蔡宜潔
Hw03
執行結果

x.add(y)= vector { a: [ 2, 3, 4 ] }
x.sub(y)= vector { a: [ 0, 1, 2 ] }
x.dot(x)= 6
x.neg(x)= vector { a: [ -1, -2, -3 ] }

[zhengyucen]

資工二 110810548 鄭宇岑

https://github.com/zhengyucen/wp109b/blob/main/30hw1.js

[YangTiChu]

資工一 110910527 楊堤筑

https://github.com/YangTiChu/wp109b/blob/main/Homework/20210416/04.js

執行結果

x.add(y)= Vector { a: [ 2, 3, 4 ] }
x.sub(y)= Vector { a: [ 0, 1, 2 ] }  
x.dot(y)= 6
x.neg()= Vector { a: [ -1, -2, -3 ] }

[YiTing1110]

資工一 110910526 張貽婷

https://github.com/YiTing1110/wp109b/blob/main/homework/HW3.js

CODE

class Vector
{
    constructor(array)
    {
        this.a = array
    }
    add(y)
    {
        var r = []
        for(var i = 0; i < this.a.length; i++)
        {
            r[i] = this.a[i] + y.a[i]
        }
        return new Vector(r)
    }
    sub(y)
    {
        var r = []
        for(var i = 0; i < this.a.length; i++)
        {
            r[i] = this.a[i] - y.a[i]
        }
        return new Vector(r)
    }
    dot(y)
    {
        var r = 0;
        for(var i = 0; i < this.a.length; i++)
        {
            r += this.a[i] * y.a[i]
        }
        return new Vector(r)
    }
    neg(y)
    {
        var r = []
        for(var i = 0; i < this.a.length; i++)
        {
            r[i] = this.a[i] * (-1)
        }
        return new Vector(r)
    }
}

var x = new Vector([1,2,3])
var y = new Vector([1,1,1])

console.log('x.add(y)=', x.add(y))
console.log('x.add(y).add(y).add(x)=', x.add(y).add(y).add(x))

console.log('x.sub(y)=', x.sub(y))

console.log('x.dot(y)=', x.dot(y))

console.log('x.neg(y)=', x.neg(y))

INPUT

x.add(y)= Vector { a: [ 2, 3, 4 ] }
x.add(y).add(y).add(x)= Vector { a: [ 4, 6, 8 ] }
x.sub(y)= Vector { a: [ 0, 1, 2 ] }
x.dot(y)= Vector { a: 6 }
x.neg(y)= Vector { a: [ -1, -2, -3 ] }

[Kenttsai1]

資工一 110910509 蔡宗霖

程式3

顯示結果
KentdeAir:03 kenttsai$ deno run hw3.js
x.add(y)= Vector { a: [ 2, 3, 4 ] }
x.sub(y)= Vector { a: [ 0, 1, 2 ] }
dot = 6
x.neg(y)= Vector { a: [ -1, -2, -3 ] }

[yucing]

資工一 110910511 蘇郁晴
https://yucing.github.io/wp109b/homework3/homework3.js

結果
x.add(y)= Vector { a: [ 2, 3, 4 ] }
x.sub(y)= Vector { a: [ 0, 1, 2 ] }
x.dot(y)= 6
x.neg()= Vector { a: [ -1, -2, -3 ] }

[Lin610313]

資工一110910506林庭光
https://github.com/Lin610313/wp109b/blob/main/week10/vector.js

[Uriel58]

https://github.com/Uriel58/wp109b/blob/main/week10/hw.js
資工一林成也

[iwantall2333]

資工一110910540莊汶娟
程式碼

class Vector{
    constructor(a){
        this.a=a;
    }           
    add(b){  
        var save=[];       
        for(var i=0;i<this.a.length;i++){
            save[i]=this.a[i]+b.a[i];
        }
        return new Vector(save) 
    }
    neg(){
        var save=[];
        for(var i=0;i<this.a.length;i++) save[i]=-this.a[i];
        return new Vector(save)
    }
    sub(b){
        var save=[];
        for(var i=0;i<this.a.length;i++) save[i]=this.a[i]+b.neg().a[i];
        return new Vector(save)
    }
    dot(b){
        var save=0;
        for(var i=0;i<this.a.length;i++){
            save+=this.a[i]*b.a[i]
        } 
        return save
    }
}
var x = new Vector([1,2,3])
var y = new Vector([1,1,1])
console.log("+:",x.add(y));
console.log("neg",x.neg(y));
console.log("sub",x.sub(y));
console.log("dot",x.dot(y));

執行結果

D:\課程\網頁設計\wp109b\homework\week10>deno run objectTry.js
+: Vector { a: [ 2, 3, 4 ] }
neg Vector { a: [ -1, -2, -3 ] }
sub Vector { a: [ 0, 1, 2 ] }
dot 6

[Roy-Roo]

資工一 110910519 羅彥翔
https://github.com/Roy-Roo/wp109b/blob/main/week10/HW3/vector.js

[WengChihTung]

進觀四 翁志彤 210611354
https://github.com/WengChihTung/wp109b/blob/main/homework/03/vector.js

class Vector {
    constructor(array) {
        this.a = array
    }
    add(f) {
        var r = []
        var s = this
        for (var i = 0; i < s.a.length; i++) {
            r[i] = s.a[i] + f.a[i]
        }
        return new Vector(r)
    }
    sub(f) {
        var r = []
        var s = this
        for (var i = 0; i < s.a.length; i++) {
            r[i] = s.a[i] - f.a[i]
        }
        return new Vector(r)
    }
    dot(f) {
        var r = []
        var s = this
        var k = 0
        for (var i = 0; i < s.a.length; i++) {
            r[i] = s.a[i] * f.a[i]
            k = k + r[i]
        }
        return k
    }
    neg() {
        var r = []
        var s = this
        for (var i = 0; i < s.a.length; i++) {
            r[i] = s.a[i] * (-1)
        }
        return new Vector(r)
    }
  }
  
  var x = new Vector([1, 2, 3])
  var y = new Vector([1, 1, 1])
  console.log("x.add(y)=", x.add(y))
  console.log("x.sub(y)=", x.sub(y))
  console.log("x.dot(y)=", x.dot(y))
  console.log("x.neg()=", x.neg())
  

執行結果

wengchihtung@MacBook-Pro ex1 % deno run vector.js
x.add(y)= Vector { a: [ 2, 3, 4 ] }
x.sub(y)= Vector { a: [ 0, 1, 2 ] }
x.dot(y)= 6
x.neg()= Vector { a: [ -1, -2, -3 ] }