Question

How to get only the unique elements of array in TypeScript

Answer 1

const arr = [6, 9, 4, 4, 4, 5, 9, 4, 9, 8, 9, 4];

const map = arr.reduce((acc, el) => acc.set(el, (acc.get(el) || 0) + 1), new Map());

console.log([...map.keys()]);

 
 
 
/*
run:
 
[ 6, 9, 4, 5, 8 ]
 
*/
 

 

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Answer 2

const arr = [6, 9, 4, 4, 4, 5, 9, 4, 9, 8, 9, 4];

const unique = [...new Set(arr)]

console.log(unique);

 
 
 
/*
run:
 
[ 6, 9, 4, 5, 8 ]
 
*/
 

 

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