Question

我在角度2 .ts（类型脚本）文件中声明了两个如下所示的数组。

 parentArray:Array<Model> and initialized with  {a,b,c,d}
 modifiedAarray:Array<Model> modified with data {c,e,f,g}

通过比较两个数组如何有效地找到两者之间的差异？ [ie]查找新添加的和已存在的元素

Answer 1

使用filter。

var original = ['a','b','c','d'];
var newarray = ['c','e','f','g'];

var addedEls = newarray.filter(function(a){ return original.indexOf(a) < 0; });
var remvdEls = original.filter(function(a){ return newarray.indexOf(a) < 0; });

alert("These were added: "+addedEls.join(","));
alert("These were removed: "+remvdEls.join(","));

Answer 2

使用filter和Observable：

Observable.from(parentArray)
  .filter(item => {
    // Condition here with modifiedAarray
    // IE: return modified.attribute !== item.attribute;
  })
  .subscribe(item => console.log(item));

如何在JS或角度2

2 个答案: