相关疑难解决方法(0)

我有以下功能:

function isBigEnough(element, index, array) {
  return (element >= 10);
}
var filtered = [12, 5, 8, 130, 44].filter(isBigEnough);
// filtered is [12, 130, 44] 

如何返回大于(或等于)除10？之外的数字的值？例如,array.filter(isBigEnough(15))会给我44, 130

arr.filter(callback[, thisArg])

https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

因此，这是我应该理解的文档中的示例。

Arr =一些数组，很棒。filter =数组具有的一种方法，很棒。回调=一些功能，基本上。大。那是[, thisArg]什么

查看一些关于stackoverflow的示例，结果显示：

objects.filter(function (obj) {
  return obj.someIntProp <= 1000 
});

我了解这是如何工作的，我不需要使用它的帮助。我只想了解[, thisArg]应该如何告诉我该函数采用数组中的每个对象。我觉得我似乎错过了大多数人都可以在Coding 101中学习的显而易见的东西。

这里我有folderObjs数组，这个数组的控制台在下面的代码中，我放置了搜索输入字段，我想通过文件夹名称和文件夹大小以角度搜索这个数组，这怎么可能？

HTML

<mat-form-field>
 <input matInput (keyup)="applyFilter($event.target.value)" placeholder="Search">
</mat-form-field>

<div *ngFor="let folder of folderObjs">
  <span>{{folder.folderName}}</span>
  <span>{{folder.folderSize}}</span>
</div>

TS

folderObjs : Folder[] = [];

applyFilter(filterValue) {
  console.log(this.folderObjs);
// 0: {folderid: 781, folderName: "pelu folder",folderActivity: "true", …}
   1: {folderid: 782, folderName: "biju folder", folderActivity: "true", …}
   filter: "d"
   length: 2

  this.folderObjs.filter = filterValue.trim().toLowerCase();
}

如何在javascript中收集对象数组,例如我在这种情况下有这个数组:

var abc = [{"name": "udin", "checked": true}, {"name": "kabayan": "checked": true}, {"name": "hebring"}];

如何得到这样的结果:

abc = [{"name": "udin", "checked": true}, {"name": "kabayan": "checked": true}];

我只想显示"checked"== true的元素

我正在尝试在数组内的对象内循环数组内的对象，我真的很困惑！

这是我的arr：

var arr = [
{
title: "Harry Potter",
categories: [
{
id: 39,
name: "Popular Books"
},
{
id: 3,
name: "Kids"
},
{
id: 79,
name: "All Books"
}
]
},


{
title: "Pride and Prejudice",
categories: [
{
id: 36,
name: "Classic Books"
},
{
id: 3,
name: "Woman"
},
{
id: 79,
name: "All Books"
}
]
}
]

如何获取只有类别名称“儿童”的图书的标题？

现在我能想到的只有：

var find = function(arr){
  for(var i=0; i<arr.length; i++){
    for(var j=0; j<arr[i].categories; j++){
      console.log(arr[i].categories[j].name)
    } …

我有一个data包含以下内容的对象:

{
  "content": {
    "id": "someID",
    "type": "unit",
    "method": "xyz",
    "blocks": [{
      "key": "blue",
      "data": [
        "Array"
      ]
    }, {
      "key": "red",
      "data": [
        "Array"
      ]
    }, {
      "key": "yellow",
      "data": [
        "Array"
      ]
    }, {
      "key": "black",
      "data": [
        "Array"
      ]
    }],
    "notes": "abc"
  }
}

我想删除block那个有密钥yellow,通过循环blocks,其余的数据应保持原样.所以预期的最终结果是

{
  "content": {
    "id": "someID",
    "type": "unit",
    "method": "xyz",
    "blocks": [{
      "key": "blue",
      "data": [
        "Array"
      ]
    }, {
      "key": "red",
      "data": [
        "Array" …

我有一个这样的数组：

const rawdata = [
  {
    top_feature_col: "s9",
    top_feature_row: 1,
    data: [{ cluster: 0, value: 151508, opportunity_perc: 69 }]
  },
  {
    top_feature_col: "s9",
    top_feature_row: 2,
    data: [{ cluster: 0, value: 127518, opportunity_perc: 70 }]
  },
  {
    top_feature_col: "s9",
    top_feature_row: 2,
    data: [{ cluster: 1, value: 12668, opportunity_perc: 40 }]
  }
];

我想过滤哪里，opportunity_perc >= 50但我不知道该怎么做。

结果应该是：

const result = [
  {
    top_feature_col: "s9",
    top_feature_row: 1,
    data: [{ cluster: 0, value: 151508, opportunity_perc: 69 }]
  },
  {
    top_feature_col: "s9",
    top_feature_row: …

我有一个数据数组，我需要将这些数据过滤到 React js 中的变量中。

这是我的数组

[{idappcontent: "Com_01", idcontenttype: "0", idclient: "5"},
 {idappcontent: "Com_02", idcontenttype: "0", idclient: "5"},
 {idappcontent: "Com_03", idcontenttype: "0", idclient: "5"},
 {idappcontent: "Review1_Ques_01", idcontenttype: "0", idclient: "5"},
 {idappcontent: "Review1_Ques_02", idcontenttype: "0", idclient: "5"},
 {idappcontent: "Sign_01", idcontenttype: "0", idclient: "5"},
 {idappcontent: "Sign_02", idcontenttype: "0", idclient: "5"},
 {idappcontent: "Thank_01", idcontenttype: "0", idclient: "5"},
 {idappcontent: "Thank_02", idcontenttype: "0", idclient: "5"}
]

我需要获取包含“idappcontent ==”Sign_“”的数据。如何过滤与“Sign_”字符串匹配的数组数据？

是否有内置的Javascript函数或库可以执行以下操作：

const data = [
    { name: 'name1', type: 'type1' },
    { name: 'name2', type: 'type2' },
    { name: 'name3', type: 'type3' },
    { name: 'name4', type: 'type2' },
];

要搜索以下内容并返回所有对象，其中 type = 'type2'

类似data.findIndex((i) => i.type === 'type2')但返回所有匹配项而不是第一个索引？

谢谢

export class ResultComponent {
    students: AdmissionFormData[]

    constructor(private adStudent: AdmissionFormService) {
        adStudent.adFormGet().subscribe(
            x => this.students = x
        )
    }

    onSubmit(value) {

    }
}

在学生数组中，我有数据。而onSubmit是函数，value是参数“roll”

HTML 文件：

<div class="form">
<div class="col-md-5 offset-md-3">
  <div class="card">
      <div class="card-header text-center">
          <h3 id="form_name" >Search Result</h3>
      </div>

      <div class="card-block">
          <form (ngSubmit)="onSubmit(f.value)" #f="ngForm" >
              <div class="form-group">
                <label for="">Roll</label>
                <input
                type="number" 
                ngModel
                name="reg" 
                #reg="ngModel" 
                [min]="99999"
                placeholder="Ex: 224697"
                class="form-control">
                <p class="text-danger" *ngIf="!reg.valid && reg.touched">Roll Should have at least 6 letter</p>
              </div>
              <input 
              type="submit"
              value="Search" 
              class="btn btn-block btn-outline-success">
          </form>
      </div>
  </div> …

我有一个对象数组，例如：

{
    "value": [
        {
            "attachment_text": "Support: hello there! I need some help syncing records",
            "ticket_text": "Ticket 1537 from ronburgundy@news.com"
        },
        {
            "attachment_text": "Copied from original request - 401 unathorized",
            "ticket_text": "Ticket 1459 from klaus.kinsky@kinsky.com"
        },
        {
            "attachment_text": "Contact request form received",
            "ticket_text": "Ticket 1173 from sophia@copolla.com"
        },
        {
            "attachment_text": "Hello, we need to troubleshoot some problems",
            "ticket_text": "Ticket 1591 from pat@pending.com"
        },
        {
            "attachment_text": "Contact request form received",
            "ticket_text": "Ticket 1483 from bugs@bunny.com"
        },
        {
            "attachment_text": "Contact request form …

我的基础数据如下......

[{
    month: 'Jan',
    cat: A,
    val: 20
},{
    month: 'Jan',
    cat: B,
    val: 5
},{
    month: 'Jan',
    cat: C,
    val: 10
},{
    month: 'Feb',
    cat: A,
    val: 30
},{
    month: 'Feb',
    cat: B,
    val: 10
},{
    month: 'Feb',
    cat: C,
    val: 20
}]

我需要使用javascript将其转换为以下内容..

[{
    month: 'Jan',
    A: 20,
    B: 5,
    C: 10
}, {
    month: 'Feb',
    A: 30,
    B: 10,
    C: 20
}]

如果基础数据只有cat和val ..

我本来可以试过像..

data[e.cat] = e.val;

但按月分组给了我..任何帮助都是真诚的感谢..