Question

我正在完成一项任务并且不需要这样做，但我希望进一步了解。我需要删除任何在此列表中删除的内容。

＆＃13;

var sentence = ["REMOVE","Today","I'm","REMOVE","excited","to","learn","REMOVE","REMOVE","about","arrays"];
console.log("Original Sentence: " + sentence);

// Your code goes here

console.log("Final Sentence: " + sentence);

＆＃13;

我是这样做的，而不是删除＆＃34; REMOVE＆＃34;，它显示每次发生删除。我如何让它做与目前正在做的相反的事情。

＆＃13;

var sentence = ["REMOVE","Today","I'm","REMOVE","excited","to","learn","REMOVE","REMOVE","about","arrays"];
console.log("Original Sentence: " + sentence);
// Your code goes here
function filterItems(query) {
  return sentence.filter(function(el) {
      return el.toLowerCase().indexOf(query.toLowerCase()) > -1;
  })
}

var test = filterItems('re');

console.log("Fixed sentence" +test);

＆＃13;

Answer 1

您正在过滤包含查询的项目，您只需更正过滤逻辑。

＆＃13;

var sentence = ["REMOVE","Today","I'm","REMOVE","excited","to","learn","REMOVE","REMOVE","about","arrays"];
console.log("Original Sentence: " + sentence);
// Your code goes here
function filterItems(query) {
  return sentence.filter(function(el) {
      return el.toLowerCase().indexOf(query.toLowerCase()) == -1;
  })
}

var test = filterItems('re');

console.log("Fixed sentence" +test);

＆＃13;

Answer 2

你的逻辑是倒退的。 Array#filter返回一个包含满足谓词的元素的新数组。你的谓词现在是＆＃34;包含单词REMOVE＆＃34;。

你想要反转（用> -1字面替换< 0）：

＆＃13;

var sentence = ["REMOVE","Today","I'm","REMOVE","excited","to","learn","REMOVE","REMOVE","about","arrays"];
console.log("Original Sentence: " + sentence);
// Your code goes here
function filterItems(query) {
  return sentence.filter(function(el) {
      return el.toLowerCase().indexOf(query.toLowerCase()) < 0;
  })
}

var test = filterItems('re');

console.log("Fixed sentence" +test);

＆＃13;

Answer 3

.filter创建了一个新数组，并且没有修改现有数组，我建议使用.splice代替......除非你打算重新使用原来的{{1}再次并期望它拥有它的原始值

这样的事情应该有效

＆＃13;

sentence

＆＃13;

Answer 4

检查有关如何使用过滤方法的链接。 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

＆＃13;

var sentence =["REMOVE","Today","I'm","REMOVE","excited","to","learn","REMOVE","REMOVE","about","arrays"];
console.log("Original Sentence: " + sentence);
var test = sentence.filter(word => word.toLowerCase() !== "remove");
console.log("Fixed sentence: " + test);

＆＃13;

使用javascript过滤和删除列表中的项目

4 个答案: