Copy the values ​​of an array

When copying one array to another in JavaScript: vararr1=['a','b','c'];vararr2=arr1;arr2.push('d');//Now, arr1=[ 'a','b','c','d'] I realized that arr2 was referencing the same array as arr1, not a new, separate array. How do I copy an array to get two separate arrays?

P粉002546490 2023-08-20 12:42:44 0  2  556

Merge/flatten an array of arrays

I have a JavaScript array, for example: [["$6"],["$12"],["$25"],["$25"],["$18"],["$22"],["$10"] ] How can I merge the separate inner arrays into one array like this: ["$6","$12",

P粉828463673 2023-08-27 12:05:43 0  2  556

Extract array from database

The array (a checkbox) is stored in the database through unserialize(), as shown in the figure, how to extract it and display it normally, for example, display: mathematics,

杰瑞 2019-11-13 15:30:46 0  0  742

Pass array to component

I'm new to React and need help with the following.. I have a component that accepts an array list to render the component and need a separate component to manipulate the array rendered component: exportfunctionDashboardContent(){return();} mockData is where I need to pass the array via the API call ...

P粉006540600 2023-08-15 17:00:37 0  1  588

How to push data to an array on localStorage - Stack Overflow

One function I want to do is to set an empty array to localstorage. Every time I click, I push the currently clicked data into the localstorage array. However, localstorage does not allow push. I have tried deep copying the localstorage array and then pushing to the deep copy. In the array, when set...

伊谢尔伦 2017-06-20 10:07:01 0  5  1286

How to add a column of type array using phpMyAdmin or sql

How to add column of type array using phpMyAdmin know change table name add column listid integer array; change table name add column listid integer[]; not working

P粉012875927 2024-03-27 00:18:52 0  1  515

How to create an array within an array?

I have these two arrays. I want to create an array within an array like this. How can I do this. The code is posted below. This is the image I'm sending in fileToUpload. The array I have Array([fileToUpload]=>Array([name]=>KERINOXCOFFEE.jpg[type]=>image/jpeg[tmp_name]=>/opt/lampp/temp/ph...

P粉744831602 2024-04-01 22:05:34 0  1  469

How to recombine two-dimensional arrays

$a = array(0=>'',1=>arrray(0=>1,1=>2),2=>'',3=>arrray(0=>1,1=>2)); How can this two-dimensional array be turned into the following one-dimensional array: $a = array(0=>'',1=>'1,2',2=>'',3=>&#39

亮 2021-09-30 10:43:02 0  4  1230

Laravel - Create arrays and arrays of objects in PHP

I'm trying to create an array of objects in laravelphp. So far I have achieved this. When I return the array I get the response, I added the image for clarity. I get this output and I want to create a response like this...[{"student":"JaimeThomas","subjects":[{"sub...

P粉298305266 2024-03-30 17:17:36 0  1  505

Filtering a subset of an array - Stack Overflow

var a = [1,2,3,4,5,6]; var b = [2,3,6]; Array b is a subset of array a. Remove the elements containing b from a. This is the optimal solution. What?

某草草 2017-05-19 10:42:41 0  4  712

How to change array object property value javascript

I have an array object and an array. Which values ​​in this array match values ​​in the array object require a change of state (like true). arrObj output should look like this: [{name:"Test1",status:true},{name:"Test2",status:false},{name:"Test3",status:true}]Demo: http...

P粉618358260 2023-09-03 14:27:32 0  1  367

Map array of arrays to list

I have an array of answers sorted by the question they belong to like this: sortedAnswers=[[Answer1,Answer2,Answer3,Answer4],[AnswerA,AnswerB,AnswerC,AnswerD]...] I'm trying to render in React List of ListItemButtons. I tried <ButtonGroupfullWidthorientation='vertical'onClick

P粉668804228 2023-09-06 20:15:44 0  2  517

Wrong array literal when inserting array into PostgreSQL column

I'm using objection.js in my application. I'm running into an issue while trying to insert an array of strings into a PostgreSQL database column. The column is defined as follows: pathTEXT[]NOTNULL This is the pattern: path:{type:'array',items:{type:'string'},notNull:true} I want to update a table c...

P粉141925181 2024-01-29 15:46:16 0  1  574

javascript - One array taking random elements from another array

There is an array a=[4,19,23,44,56,1], create a new array b, and b randomly selects one element at a time from a until it is exhausted. Implemented in JavaScript

PHP中文网 2017-05-19 10:31:39 0  7  736

javascript - How to understand sort in array arrangement

{Code...} How does this code arrange the array elements? Please give me a detailed explanation. Thank you.

PHPz 2017-05-19 10:11:03 0  3  632

How to compare two arrays in javascript

Array a {code...} Array b is part of array a {code...} Array c is modified based on array b {code...} Now the final result needs to be modified for key:1 , key:2 is deleted, key:3, key:4, key:5 is retained without change, key:22 is added {code...} Please tell me...

習慣沉默 2017-06-26 10:52:07 0  6  854

es6 - How to convert string to array in JavaScript

For example, I have a string type like this {code...} How can I convert it into an array type?

滿天的星座 2017-06-26 10:52:56 0  2  1092

Is it possible to add JSX elements in a template string of an array of objects?

I'm trying to add JSX elements like <a>,<p> to an array of objects in a template string, the project has a file called portfolio.jsx to hold the array and another called Projects.jsx file to map the array, and a ProjectsItem.jsx file to hold all the jsx and props to display the data. exp...

P粉366946380 2023-09-11 11:24:39 0  1  628

JavaScript - Remove duplicates from an array and return an array containing the duplicates and another array containing all other items

I want to run a filter or reduce operation on an array and remove all duplicates in the array based on the 'name' attribute like in this example. The examples I've seen are iterating through the array and keeping one of the duplicates, but in my case I need to separate them and return the duplicates...

P粉986937457 2023-08-17 22:28:55 0  1  515

Check for a value in an array of objects

functionweatherCodes(){letcodes=[{sunny:[1001]},{cloudy:[1002,1003]}]lettheCode=1003}; How can I check my array of objects to find if one of them contains my variable theCode

P粉176151589 2023-09-10 00:03:58 0  1  448