检查对象数组是否是另一个对象数组的子集 [英] Check if an array of object is subset of another array of object

问题描述

这就是我正在尝试的.

var object1 = {name: 'one', psno:'34'};
var object2 = {name: 'two', psno:'34'};
var object3 = {name: 'three', psno:'345'};
var arr1 = [object1,object2,object3];
var arr2 = [object1,object2];
// solution
var names = arr1.map(function(obj) { 
  return obj.name; 
});
var isSuperset = arr2.every(function(val) { 
  return names.indexOf(val) >= 0;
});
alert(isSuperset);

它返回false而不是true.我要去哪里错了.

It returns false instead of true. Where I am going wrong.

推荐答案

那是因为您在检查.indexOf

var object1 = {
  name: 'one',
  psno: '34'
};
var object2 = {
  name: 'two',
  psno: '34'
};
var object3 = {
  name: 'three',
  psno: '345'
};
var arr1 = [object1, object2, object3];
var arr2 = [object1, object2];
// solution
var names = arr1.map(function(obj) {
  return obj.name;
});
var isSuperset = arr2.every(function(val) {
//Ive changed this line!
  return names.indexOf(val.name) >= 0;
});
alert(isSuperset);

JS Fiddle在这里: https://jsfiddle.net/waqmafsa/

JS Fiddle here: https://jsfiddle.net/waqmafsa/

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