Detailed introduction to filter function in JavaScript
Dec 06, 2017 am 11:29 AM
I believe that friends who have studied Vue in JavaScript all know the filter function, but there are many friends who don’t know how to filter. If they know it, it may be ambiguous, so we will give it today. Let’s introduce the filter function in JavaScript in detail!
When I saw the grid component in the example, I was confused by a piece of nested code. I will understand it only after asking for help (segmentful questions). I hereby record it for subsequent inquiries:
Click here to see all the code
Some code snippets:
<p style="margin-top: 5px; margin-bottom: 14px; line-height: normal;">data = data.filter(function (row) {<br/> return <a href="http://ipnx.cn/wiki/60.html" target="_blank">Object</a>.keys(row).some(function (key) {<br/> return String(row[key]).toLowerCase().<br/> indexOf(filterKey) > -1;<br/> });<br/>});<br/><br/>data = [<br/> { name: 'Chuck Norris', power: Infinity },<br/> { name: 'Bruce Lee', power: 9000 },<br/> { name: 'Jackie Chan', power: 7000},<br/> { name: 'Jet Li', power: 8000 }<br/>]<br/></p> Note: Here filterKey represents the characters entered in the input String , here we assume that ck
where row represents data[i], take the first line as an example to execute Code, row is { name: 'Chuck Norris', power: Infinity }, then Object.keys(row) = ['name', 'power'], key means name and power. The first is name, row['name'] = 'Chuck Norris', this string contains the string 'ck', so is returned true, there is no need to execute power, then row, that is, data[0] returns to the new array and continues to traverse the following data. If row['name'] does not include this string, then row['power'] needs to be traversed. If both are false, no ## will be returned. #row, continue traversing.
data binding, but I won't record it because I am still in a confused state.
I am a front-end novice. If you find any mistakes in this article or do not understand it well, I hope you will give me some advice. I am currently learning Vue. When I saw the grid component in the example, I was confused by a piece of nested code. I will understand it only after asking for help from many sources (segmentful questions). I hereby record it for subsequent inquiries. ：Click here to see all the codeSome code snippets:data = data.filter(function (row) {
return Object.keys(row).some(function (key) {
return String(row[key]).toLowerCase().
indexOf(filterKey) > -1;
});
});
data = [
{ name: 'Chuck Norris', power: Infinity },
{ name: 'Bruce Lee', power: 9000 },
{ name: 'Jackie Chan', power: 7000},
{ name: 'Jet Li', power: 8000 }
]Note: HerefilterKey represents the characters entered in the input String, here we assume that ck
row represents data[i], take the first line as an example to execute the code, row is { name: 'Chuck Norris', power: Infinity }, then Object.keys(row) = ['name', 'power'], key represents name and power. The first is name, row['name'] = 'Chuck Norris', this string contains the string 'ck', so is returned true, there is no need to execute power, then row, that is, data[0] returns to the new array and continues to traverse the following data. If row['name'] does not include this string, then row['power'] needs to be traversed. If both are false, no ## will be returned. #row, continue traversing. The entire code involves Vue data binding, but I won’t record it because I am still in a state of ignorance.
Summary:
#This article introduces the filter function in JavaScript in detail through example code. I believe that friends will also know this. Learn more and hope it will be helpful to your work!
Related recommendations:
Simple application of ajax and how to write filter
Detailed introduction to the filter attribute of CSS3
The url-pattern setting method and mapping rules of servlet and filter
The above is the detailed content of Detailed introduction to filter function in JavaScript. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
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)
WebSocket and JavaScript: key technologies for implementing real-time monitoring systems
Dec 17, 2023 pm 05:30 PM
WebSocket and JavaScript: Key technologies for realizing real-time monitoring systems Introduction: With the rapid development of Internet technology, real-time monitoring systems have been widely used in various fields. One of the key technologies to achieve real-time monitoring is the combination of WebSocket and JavaScript. This article will introduce the application of WebSocket and JavaScript in real-time monitoring systems, give code examples, and explain their implementation principles in detail. 1. WebSocket technology
Recommended: Excellent JS open source face detection and recognition project
Apr 03, 2024 am 11:55 AM
Face detection and recognition technology is already a relatively mature and widely used technology. Currently, the most widely used Internet application language is JS. Implementing face detection and recognition on the Web front-end has advantages and disadvantages compared to back-end face recognition. Advantages include reducing network interaction and real-time recognition, which greatly shortens user waiting time and improves user experience; disadvantages include: being limited by model size, the accuracy is also limited. How to use js to implement face detection on the web? In order to implement face recognition on the Web, you need to be familiar with related programming languages ??and technologies, such as JavaScript, HTML, CSS, WebRTC, etc. At the same time, you also need to master relevant computer vision and artificial intelligence technologies. It is worth noting that due to the design of the Web side
How to implement an online speech recognition system using WebSocket and JavaScript
Dec 17, 2023 pm 02:54 PM
How to use WebSocket and JavaScript to implement an online speech recognition system Introduction: With the continuous development of technology, speech recognition technology has become an important part of the field of artificial intelligence. The online speech recognition system based on WebSocket and JavaScript has the characteristics of low latency, real-time and cross-platform, and has become a widely used solution. This article will introduce how to use WebSocket and JavaScript to implement an online speech recognition system.
Essential tools for stock analysis: Learn the steps to draw candle charts with PHP and JS
Dec 17, 2023 pm 06:55 PM
Essential tools for stock analysis: Learn the steps to draw candle charts in PHP and JS. Specific code examples are required. With the rapid development of the Internet and technology, stock trading has become one of the important ways for many investors. Stock analysis is an important part of investor decision-making, and candle charts are widely used in technical analysis. Learning how to draw candle charts using PHP and JS will provide investors with more intuitive information to help them make better decisions. A candlestick chart is a technical chart that displays stock prices in the form of candlesticks. It shows the stock price
JavaScript and WebSocket: Building an efficient real-time weather forecasting system
Dec 17, 2023 pm 05:13 PM
JavaScript and WebSocket: Building an efficient real-time weather forecast system Introduction: Today, the accuracy of weather forecasts is of great significance to daily life and decision-making. As technology develops, we can provide more accurate and reliable weather forecasts by obtaining weather data in real time. In this article, we will learn how to use JavaScript and WebSocket technology to build an efficient real-time weather forecast system. This article will demonstrate the implementation process through specific code examples. We
Simple JavaScript Tutorial: How to Get HTTP Status Code
Jan 05, 2024 pm 06:08 PM
JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest
PHP and JS Development Tips: Master the Method of Drawing Stock Candle Charts
Dec 18, 2023 pm 03:39 PM
With the rapid development of Internet finance, stock investment has become the choice of more and more people. In stock trading, candle charts are a commonly used technical analysis method. It can show the changing trend of stock prices and help investors make more accurate decisions. This article will introduce the development skills of PHP and JS, lead readers to understand how to draw stock candle charts, and provide specific code examples. 1. Understanding Stock Candle Charts Before introducing how to draw stock candle charts, we first need to understand what a candle chart is. Candlestick charts were developed by the Japanese
How to get HTTP status code in JavaScript the easy way
Jan 05, 2024 pm 01:37 PM
Introduction to the method of obtaining HTTP status code in JavaScript: In front-end development, we often need to deal with the interaction with the back-end interface, and HTTP status code is a very important part of it. Understanding and obtaining HTTP status codes helps us better handle the data returned by the interface. This article will introduce how to use JavaScript to obtain HTTP status codes and provide specific code examples. 1. What is HTTP status code? HTTP status code means that when the browser initiates a request to the server, the service
