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Daniel Zotti
Daniel Zotti

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Operations between sets with JavaScript

#learnedtoday #javascript #array #set

Have you ever dealt with operations between sets in JavaScript, such as union, intersection or difference?

Here some ideas of implementation:

Union

Union operation

with arrays 

const union = arr1.concat(arr2);
// OR
const union = [...arr1, ...arr2];
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with sets 

const union = new Set([...set1, ...set2]);
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Intersection

Intersecion operation

with arrays 

const intersection = arr1.filter(x => arr2.includes(x));
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with sets 

const intersection = new Set([...set1].filter(x => set2.has(x)));
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Difference (from A to B)

Difference operation

with arrays 

const difference = arr1.filter(x => !arr2.includes(x))
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with sets 

const difference = new Set([...set1].filter(x => !set2.has(x)));
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Symmetric Difference

Symmetric operation

with arrays 

const symmetricDifference = arr1
           .filter(x => !arr2.includes(x))
           .concat(arr2.filter(x => !arr1.includes(x)))
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with sets 

const symmetricDifference = new Set([...set1]
           .filter(x => !set2.has(x))
           .concat([...set2].filter(x => !set1.has(x))))
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Demo

Have a look at this simple Stackblitz demo to play with the examples.

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