JAVASCRIPT

sort javascript number array with duplicates

//ascending order
console.log([1, 2, 0, 1].sort((a, b) => a - b))

//descending order
console.log([1, 2, 0, 1].sort((a, b) => b - a))
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duplicate numbers in an array javascript

[1, 1, 2, 2, 3].filter((element, index, array) => array.indexOf(element) !== index) // [1, 2]