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This article is about how JavaScript uses indexOf to remove duplicates in arrays. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Weight removal by indexOf

Function unique (arr) {if (! Array.isArray (arr)) {console.log ('type errorships') Return} var array = []; for (var I = 0; I < arr.length; itemized +) {if (array .indexOf (arr [I]) = =-1) {array. Push (arr [I])} return array;} var arr = [1Jing 1 de truejue de trueju de trueju de truejue, 15 pas falseforme false, undefined,undefined, null,null, NaN, NaN,'NaN', 0, 0,'a moment,'a moment, {}, {}] Console.log (unique (arr)) / / [1, "true", true, 15, false, undefined, null, NaN, NaN, "NaN", 0, "a", {... }, {... }] / / NaN, {} have not been duplicated

Create an empty result array, for loop the original array, determine whether there is a current element in the result array, skip if it has the same value, and push into the array if it is different.

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