<>ES6 Three simple methods of array de duplication
<> Let's talk about the use of ES6 Three ways to realize array de duplication .
<> The first kind : utilize Map Object and array filter method
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Printed results
By printing, we found that , It really achieved the effect we wanted . So here's a brief explanation .
1.Map The target is ES6 Provides a new data structure , among has The way to do this is to return a Boolean value , Indicates whether a value has a current value Mp Among the objects ,set The best way is to give Map Object settings key/value.
2.filter() Method to create a new array , The elements in the new array are checked by all the elements in the specified array that meet the criteria .
So ,Map Object combination filter Method can achieve the effect of array de duplication ~
<> The second kind ： utilize Set Object and array Array.from method
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Print the running results
In a nutshell , The second method is simpler than the first . Let's also explain briefly .
1.Set yes ES6 New data structure , It's like an array , But there are no duplicate values .
2.Array.from Method is used to turn two types of objects into real arrays ： Array like objects （array-like object） And ergodic （iterable） Object of （ include
ES6 New data structure Set and Map）.
therefore set combination Array.from It can also achieve the effect of array de duplication . But it should be noted that , Mainstream browsers like Chrome,Firfox,Opera,Safari, Including Microsoft's Edge, They are all supportive , But only IE Series not supported .
<> The third kind ： utilize Set+ Extension operator …
The third way is simpler
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Results run after printing
<> That's how to use it ES6 Three ways to achieve array de duplication with new features , The common advantage of these three methods is that the code is concise , about undefined and NaN It can also achieve the effect of weight removal ~~
<> If you have other ways, please share them ~
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