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This article mainly introduces the javascript es6 how to judge whether the array contains the same value, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Judgment method: 1, the array into the Set collection, and use the size attribute to get the total number of Set elements, syntax "new Set (arr) .size"; 2, use the length attribute to obtain the total number of array elements; 3, compare the total number of Set elements and the total number of array elements are equal, not equal, it contains the same value, otherwise there is no.

The operating environment of this tutorial: windows7 system, ECMAScript version 6, Dell G3 computer.

In es6, you can use Set to determine whether there are the same elements in the array.

ES6 provides a new data structure in which the values of members in Set,Set are unique and there are no duplicate elements.

The method of determining whether there are the same elements in an array:

Converts the array to Set and uses the size attribute to return the total number of current Set elements

Determine whether the total number of Set elements is equal to the total number of array elements

Let arr = [1console.log (arr). Size! = = arr.length) {console.log ("have the same element-Yes");} else {console.log ("no same element-No");}

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