


Examples to explain JS implementation of removing duplicate json from arrays
This article mainly introduces the JS method to remove duplicate json in the array, involving JavaScript traversal, judgment, access and other related operation skills for json array data. Friends in need can refer to it, hoping to help everyone better master it. Knowledge of js and json.
var array = [{"name":"123"},{"name":"123"},{"name":"456"}]; unique(array); function unique(list) { var arr = []; for (var i = 0; i < list.length; i++) { if (i == 0) arr.push(list[i]); b = false; if (arr.length > 0 && i > 0) { for (var j = 0; j < arr.length; j++) { if (arr[j].typesname == list[i].typesname) { b = true; //break; } } if (!b) { arr.push(list[i]); } } } return arr; }
Have you all learned it? Hurry up and give it a try.
Related recommendations:
How Vue exports json data to Excel spreadsheet method
How jquery reads data from json and appends it to In html
Manipulate JSON objects in Javascript and add a simple implementation of deletion and modification
The above is the detailed content of Examples to explain JS implementation of removing duplicate json from arrays. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

The method of using a foreach loop to remove duplicate elements from a PHP array is as follows: traverse the array, and if the element already exists and the current position is not the first occurrence, delete it. For example, if there are duplicate records in the database query results, you can use this method to remove them and obtain results without duplicate records.

How to remove the word "Qingyan" from Qingyan Camera? When taking photos with Qingyan Camera APP, the word "Qingyan" will be left behind. Many friends don't know how to remove the word "Qingyan". Next, the editor brings the word "Qingyan" to the players. Tutorial on how to remove the word "light face" on the face camera. Interested players should come and take a look! Qingyan Camera usage tutorial: How to remove Qingyan characters from Qingyan Camera 1. First unlock the phone and enter the desktop, find the [Qingyan Camera] APP and open the entry page; 2. Then jump to the main page of the Qingyan Camera APP and click on the upper left corner [Circle] button; 3. Then the multi-function menu bar will expand at the top, select [Camera Settings]; 4. Finally, find the button behind [Watermark Settings] as shown in the picture below and slide it to dark color to remove it.

The performance comparison of PHP array key value flipping methods shows that the array_flip() function performs better than the for loop in large arrays (more than 1 million elements) and takes less time. The for loop method of manually flipping key values takes a relatively long time.

Multidimensional array sorting can be divided into single column sorting and nested sorting. Single column sorting can use the array_multisort() function to sort by columns; nested sorting requires a recursive function to traverse the array and sort it. Practical cases include sorting by product name and compound sorting by sales volume and price.

Methods for deep copying arrays in PHP include: JSON encoding and decoding using json_decode and json_encode. Use array_map and clone to make deep copies of keys and values. Use serialize and unserialize for serialization and deserialization.

The best practice for performing an array deep copy in PHP is to use json_decode(json_encode($arr)) to convert the array to a JSON string and then convert it back to an array. Use unserialize(serialize($arr)) to serialize the array to a string and then deserialize it to a new array. Use the RecursiveIteratorIterator to recursively traverse multidimensional arrays.

PHP's array_group_by function can group elements in an array based on keys or closure functions, returning an associative array where the key is the group name and the value is an array of elements belonging to the group.

PHP's array_group() function can be used to group an array by a specified key to find duplicate elements. This function works through the following steps: Use key_callback to specify the grouping key. Optionally use value_callback to determine grouping values. Count grouped elements and identify duplicates. Therefore, the array_group() function is very useful for finding and processing duplicate elements.
