Created
January 31, 2018 10:16
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Sets: Union, Intersection and Difference
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| const union = (...sets) => | |
| sets.reduce((acc, set) => { | |
| set.forEach(val => acc.add(val)); | |
| return acc; | |
| }, new Set); | |
| const intersection = (...sets) => | |
| sets.reduce((acc, set) => { | |
| set.forEach(val => { | |
| if (sets.every(set => set.has(val))) | |
| acc.add(val); | |
| }); | |
| return acc; | |
| }, new Set); | |
| const difference = (...sets) => | |
| sets.reduce((acc, set) => { | |
| const others = sets.filter(other => set != other); | |
| set.forEach(val => { | |
| if (others.every(set => !set.has(val))) | |
| acc.add(val); | |
| }); | |
| return acc; | |
| }, new Set); |
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