javascript - 如何检查对象数组是否包含 Node 中的特定对象

Question

我在 Node 中有以下代码-

function ABC(a,b,c) {
    this.a = a;
    this.b = b;
    this.c = c;
    this.equals = function(other) {
     return other.a == this.a &&
      other.b == this.b &&
      other.c === this.c;
    };
}

var a1 =  new ABC("1", "1", 0.94924088690462316);
var a2 =  new ABC("1", "1", 0.94924088690462316);

console.log(a1 === a2);
var arr = [a1];
console.log(arr.includes(a2));

这段代码输出是-

 false
 false

如何检查数组是否包含特定对象？

Answer 1

因为看起来您正在尝试检查对象是否包含相同的值，请注意您已经定义了一个 equals 方法 - 只需使用它:

function ABC(a,b,c) {
    this.a = a;
    this.b = b;
    this.c = c;
    this.equals = function(other) {
     return other.a == this.a &&
      other.b == this.b &&
      other.c === this.c;
    };
}

var a1 =  new ABC("1", "1", 0.94924088690462316);
var a2 =  new ABC("1", "1", 0.94924088690462316);

console.log(a1.equals(a2));

您可以通过在原型(prototype)上定义方法来提高代码的效率:

function ABC(a, b, c) {
  this.a = a;
  this.b = b;
  this.c = c;
}

ABC.prototype.equals = function(other) {
  return other.a == this.a &&
    other.b == this.b &&
    other.c === this.c;
};

var a1 = new ABC("1", "1", 0.94924088690462316);
var a2 = new ABC("1", "1", 0.94924088690462316);

console.log(a1.equals(a2));

此外，请记住 0.94924088690462316 包含太多重要数字，Javascript 无法处理 - 该数字将存储为 0.9492408869046232:

console.log(0.94924088690462316);