How to get all unique values remove duplicates in a JavaScript array
We can get all unique values in a JavaScript array in the following ways Table of Content Using for loop Using the Array filter method Using set Method Using reduce Method Using forEach Method Using indexOf Method Using Underscore js uniq Function
Javascript Filter array to have unique values Stack Overflow, You can use Array filter function to filter out elements of an array based on the return value of a callback function The callback function runs for every element of the original array The logic for the callback function here is that if the indexOf value for current item is same as the index it means the element has been encountered first time so it can be considered unique
Javascript Get unique values in an array thisPointer
Function getUniqueArray array in the newArray get only the elements which pass the test implemented by the filter function the test is to check if the element s index is same as the index passed in the argument let newArray array filter element index array array indexOf element index return newArray
Javascript Get unique values from array of objects Stack Overflow, I know I know me too but my answer s a bit more succinct new Set arr map JSON stringify map JSON parse This has the usual caveats with using JSON stringify namely that according to spec you can t rely on the order of keys to be consistent If you only have a single key this will never be a problem
Javascript Get the unique values from two arrays and put them in
Javascript Get the unique values from two arrays and put them in , Var array3 array1 concat array2 array3 array3 sort function a b return a b array3 array3 filter function num index return num array3 index 1 array3 will have only unique values this also does the job in two loops which is pretty inexpensive it should be noted that sort and filter are ECMA5
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JavaScript Array Distinct Ever wanted to get distinct elements
JavaScript Array Distinct Ever wanted to get distinct elements There are two common ways in ES5 and ES6 respectively of getting unique values in JavaScript arrays of primitive values Basically in ES5 you first define a distinct callback to check if a value first occurs in the original array then filter the original array so that only first occurred elements are kept
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The latter is also known as using the spread syntax with array literal notation Putting the two together we can get the unique values from the array with a one liner Array from new Set oldArray The equivalent code using the spread syntax is new Set oldArray Note that using Set with JavaScript objects works a Get Unique Values From a JavaScript Array Using Set ES6 . The Set object lets you store unique values of any type whether primitive values or object references Now reference for each of those arrays inside that Set constructor will be different so they are not considered to be a unique value by the constructor Method 2 Using filter indexOf The filter method creates a new array with all elements that pass the test implemented by the provided function The indexOf method returns the first index at which a given element can be found in the array or 1 if not present
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