删除数组上的某些元素后如何再次使用它

Question

我有一个示例数组：

let sampleArray = ["spider", "regards", "sorry"];

如果我使用if 语句并删除其上的一些元素，我如何使用新值声明新的示例数组。

这是我的代码：

let sampleArray = ["banana", "apple", "orange", "grapes"];
     //let say the value of "fruits = apple"       
    if(sampleArray.includes(fruits)){ // will return TRUE, since 'apple' is included in the sampleArray

    //Now, I will remove it on the array
    sampleArray = sampleArray.filter(e => e !== fruits); 
    console.log("sampleArray: ", sampleArray) // return ["banana", "orange", "grapes"]

现在，我怎样才能再次将它应用到SAME if 语句中，if(sampleArray.includes(fruits)) 以便如果我再次调用它，值是现在 ["banana", "orange", "grapes"]，我的新水果是葡萄来拥有新的数组["banana", "orange"]

这可能吗？我只能使用该语句(sampleArray.includes(fruits))一次。

Answer 1

您可以使用filter() 方法从数组中删除任何值以重用必须将其存储在新变量中的新数组

filter()不会改变原始数组

let sampleArray = ["banana", "apple", "orange", "grapes"];
var fruits = 'apple';
if(sampleArray.includes(fruits)){
let newArray = sampleArray.filter(e => e !== fruits);   //let say the value of "fruits = apple"   Now, I will remove it on the array 
console.log("afterRemove: ", newArray) 
console.log("sampleArray: ", sampleArray) // will return TRUE, since 'apple' is included in the sampleArray 
}

实现这一目标的其他方式

let sampleArray = ["banana", "apple", "orange", "grapes"];

function checkforemove(v) {
  return v !="apple";
} 

   
 var newarray = sampleArray.filter(checkforemove);
console.log(newarray);