This article describes how JS simply removes duplicates in an array. Share it for your reference, as follows:
<!DOCTYPE html><html lang="zh-cn"><head><meta charset="UTF-8"><title></title></head><body><script>var arr = ["aaa","bbb","aaa","cc","ddd","cc"];function unique(arr) { var result = [], hash = {}; for (var i = 0, elem; (elem = arr[i]) != null; i++) { if (!hash[elem]) { result.push(elem); hash[elem] = true; } } return result;}console.info(unique(arr));</script></body></html>The renderings are as follows:
For more information about JavaScript related content, please check out the special topics of this site: "Summary of JavaScript array operation techniques", "Summary of JavaScript mathematical operation usage methods", "Summary of JavaScript data structures and algorithm techniques", "Summary of JavaScript switching effects and techniques", "Summary of JavaScript search algorithm techniques", "Summary of JavaScript animation effects and techniques", "Summary of JavaScript errors and debugging techniques" and "Summary of JavaScript traversal algorithms and techniques"
I hope this article will be helpful to everyone's JavaScript programming.