javascript - 删除数组中的一些元素后如何再次使用数组

Question

我有一个示例数组:

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

如果我使用if语句并删除其中的一些元素，如何声明具有新值的新示例数组。

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，如何再次将其应用到 SAME if 语句 if(sampleArray.includes(fruits)) 中，这样如果我再次调用它，现在的值就是["banana", "orange", "grapes"] 我的新水果是葡萄，它有新的 ["banana", "orange"] 数组

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

Answer 1

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

filter()不改变原数组

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 
}

实现这一点的其他方法

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

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

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