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Get unique item from two different array in JavaScript
We are required to make a function that accepts an array of arrays, and returns a new array with all elements present in the original array of arrays but remove the duplicate items.
For example − If the input is −
const arr = [ [12, 45, 65, 76, 76, 87, 98], [54, 65, 98, 23, 78, 9, 1, 3], [87, 98, 3, 2, 123, 877, 22, 5, 23, 67] ];
Then the output should be single array of unique elements like this −
[ 12, 45, 54, 78, 9, 1, 2, 123, 877, 22, 5, 67 ]
Example
const arr = [
[12, 45, 65, 76, 76, 87, 98],
[54, 65, 98, 23, 78, 9, 1, 3],
[87, 98, 3, 2, 123, 877, 22, 5, 23, 67]
];
const getUnique = (arr) => {
const newArray = [];
arr.forEach((el) => newArray.push(...el));
return newArray.filter((item, index) => {
return newArray.indexOf(item) === newArray.lastIndexOf(item);
});
};
console.log(getUnique(arr));Output
The output in the console will be −
[ 12, 45, 54, 78, 9, 1, 2, 123, 877, 22, 5, 67 ]
Updated on: 21-Aug-2020
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