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Picking out uniques from an array in JavaScript
Suppose we have an array that contains duplicate elements like this −
const arr = [1,1,2,2,3,4,4,5];
We are required to write a JavaScript function that takes in one such array and returns a new array. The array should only contain the elements that only appear once in the original array.
Therefore, let’s write the code for this function −
Example
The code for this will be −
const arr = [1,1,2,2,3,4,4,5];
const extractUnique = arr => {
const res = [];
for(let i = 0; i < arr.length; i++){
if(arr.lastIndexOf(arr[i]) !== arr.indexOf(arr[i])){
continue;
};
res.push(arr[i]);
};
return res;
};
console.log(extractUnique(arr));Output
The output in the console will be −
[ 3, 5 ]
Updated on: 21-Oct-2020
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