How JavaScript uses the unique function

Editor to share with you how JavaScript uses the unique function, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Unique: array deduplicates and returns a new array

Function unique (arr) {if (! isArrayLink (arr)) {/ / is not a class array object return arr} let result = [] let objarr = [] let obj = Object.create (null) arr.forEach (item = > {if (isStatic (item) {/ / is the raw data let key = item +'_'+ getRawType (item) except symbol If (! obj [key]) {obj [key] = true result.push (item)}} else {/ / reference type and symbol if (! objarr.includes (item)) {objarr.push (item) result.push (item)}} }) return resulte} what can JavaScript do? It can make web pages interactive, such as responding to user clicks and providing users with a better experience. two。 You can process forms, verify user input, and provide timely feedback to save users time. 3. The page can be created dynamically according to the user's operation. 4 using JavaScript, you can set up some temporary information that cookie stores on the browser.

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