How to efficiently remove duplicate items from js array
This chapter will introduce to you how to efficiently remove duplicate items in js arrays. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Method 1: Regular mode
1. Construct a new temporary array to store the results
2. Each time in the for loop, from Take out an element from the original array, use this element to loop and compare it with the temporary array
3. If the element does not exist in the temporary array, store it in the temporary array
Method 2: Use the default Js array sort, which is sorted by ASCII;
If you want to arrange it in ascending and descending order:
1. Sort the current array first
2. Check whether the i-th element in the current array is the same as the last element in the temporary array. Because it has been sorted, the duplicate elements will be in Adjacent positions
3. If they are not the same, store the element in the result array
Method 3:
1. Create a new array to store the results
2. Create an empty object json
3. During the for loop, take out an element each time and compare it with the object. If this If the element is not repeated, it is stored in the result array. At the same time, the content of this element is used as an attribute of the object, assigned a value of 1, and stored in the object created in step 2.
Explanation: As for how to compare, it is to take out one element from the original array each time, and then access the attribute in the object. If the value can be accessed, it means it is repeated.
The above is all about how to efficiently remove duplicate items in js arrays. I hope it can give you a reference. For more related tutorials, please visit JavaScript video Tutorial!
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
How to remove elements from es6 array
Jan 11, 2023 pm 03:51 PM
Method: 1. Use shift() to delete the first element, the syntax is "array.shift()"; 2. Use pop() to delete the last element, the syntax is "array.pop()"; 3. Use splice() to delete Elements at any position, the syntax is "array.splice(position, number)"; 4. Use length to delete the last N elements, the syntax is "array.length=original array length-N"; 5. Directly assign the empty array "[ ]" to clear the element; 6. Use delete to delete an element at the specified subscript.
How to get the length of an array in js
Jun 20, 2023 pm 05:33 PM
Getting the length of an array in JS is very simple. Each array has a length property, which returns the maximum length of the array, that is, its value is equal to the maximum subscript value plus 1. Since numeric subscripts must be less than 2^32-1, the maximum value of the length attribute is equal to 2^32-1. The following code defines an empty array, and then assigns a value to the element with the index equal to 100, then the length property returns 101. Therefore, the length attribute cannot reflect the actual number of array elements.
How to convert string to array in javascript
Nov 23, 2022 pm 07:28 PM
3 conversion methods: 1. Use split() to split a given string into a string array, the syntax is "str.split (separator, maximum length of array)"; 2. Use the expansion operator "... ", iterable string object, convert it into a character array, the syntax "[...str]"; 3. Use Array.from() to convert the string into an array, the syntax "Array.from(str) ".
Excel duplicate filter color marking
Jul 31, 2023 pm 01:21 PM
How to filter and colorize duplicate items in excel: 1. Open the excel table that needs to be filtered and colorized; 2. Select the data range that needs to be filtered; 3. In the excel function menu, click the "Data" option, and then click "Delete Duplicates" "; 4. In the pop-up dialog box, there is an option to define the rules for "Remove Duplicates", make sure the column you want to filter is selected, and uncheck the "My data contains headers" option, if the data contains headers, Then click "OK".
Can js array be converted into php array?
Jun 02, 2023 am 10:06 AM
The js array can be converted into a php array. The operation method is: 1. Create a php sample file; 2. Use the syntax "JSON.stringify()" to convert the js array into a string in JSON format; 3. Use the syntax "json_decode()" "Convert the JSON format string to a PHP array. The parameter true is added here, which means that the JSON format string is converted into a PHP associative array.
There are several ways to delete an element from a js array
Aug 02, 2023 am 10:09 AM
There are 4 ways to delete an element from a js array, namely: 1. Use splice; 2. Use filter; 3. Use the pop method and shift; 4. Use the delete keyword.
JS array sorting: how to use the sort() method
Dec 27, 2023 pm 03:40 PM
JavaScript's Array.prototype.sort() method is used to sort the elements of an array. This method sorts in place, that is, it modifies the original array rather than returning a new sorted array. By default, the sort() method sorts strings according to their Unicode code point values. This means that it is used primarily for sorting strings and numbers, rather than for sorting objects or other complex data types.
How to find the length and sum of elements of an array in JavaScript
Sep 20, 2022 pm 02:11 PM
In JavaScript, you can use the length attribute to get the length of the array, the syntax is "array object.length"; you can use the reduce() or reduceRight() function to find the sum of elements, the syntax is "arr.reduce(function f(pre,curr){ return pre+cur})" or "arr.reduceRight(function f(pre,curr){return pre+cur})".
