How to implement array deduplication in Javascript

王林

Release： 2023-05-13 14:07:26

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Array deduplication

1. from() overlay new Set() method

The from method can be used directly to deduplicate string or numeric arrays.

var plants = ['Saturn', 'Earth', 'Uranus', 'Mercury', 'Venus', 'Earth', 'Mars', 'Jupiter']; var uniquePlants = Array.from(new Set(plants)); console.log(uniquePlants); // [ 'Saturn', 'Earth', 'Uranus', 'Mercury', 'Venus', 'Mars', 'Jupiter' ]

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2. spread operator (...)

The spread operator is a major innovation of ES6 and has many powerful functions.

var plants = ['Saturn', 'Earth', 'Uranus', 'Mercury', 'Venus', 'Earth', 'Mars', 'Jupiter']; var uniquePlants = [...new Set(plants)]; console.log(uniquePlants); // [ 'Saturn', 'Earth', 'Uranus', 'Mercury', 'Venus', 'Mars', 'Jupiter' ]

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