How to determine whether an array is repeated in es6

Judgment method: 1. Use the length attribute to obtain the length of the original array; 2. Use "[...new Set(arr)]" to remove duplicate elements in the array and return a new array; 3. Use length The attribute obtains the length of the array after deduplication; 4. Use "==" to compare whether the lengths of the arrays obtained twice are equal. If they are equal, the arrays are not repeated.

The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.

es6 Method to determine whether an array is repeated

Implementation idea:

• UseThe lengthattribute gets the length of the original array

• Use[...new Set(arr)]to remove duplicate elements from the array

• Use the length attribute to obtain the length of the array after deduplication

• Use the == operator to compare whether the lengths of the arrays obtained twice are equal. If they are equal, the arrays are not repeated.

Implementation code:

var arr = [1,2,3,3,4,5]; len1=arr.length; newArr=[...new Set(arr)]; len2=newArr.length; if(len1==len2){ console.log("数组没有重复"); }else{ }

It can be seen that the arrays in the above example are repeated.

var arr = [1,2,3,4,5]; len1=arr.length; newArr=[...new Set(arr)]; len2=newArr.length; if(len1==len2){ console.log("数组没有重复"); }else{ }

It can be seen that the array in the above example is not repeated.

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