tamda/dist/set/difference.js

Practical functional programming library for TypeScript

import { infer } from '../function/infer';
export function difference() {
    return inferred.apply(undefined, arguments);
}
const inferred = infer((arrayA, arrayB, keyFn) => {
    const setB = new Set(keyFn ? arrayB.map(keyFn) : arrayB);
    const filterFn = keyFn
        ? (item, index) => !setB.has(keyFn(item, index))
        : (item) => !setB.has(item);
    return arrayA.filter(filterFn);
}, args => [args[0], args[1]].every(arg => arg instanceof Array));
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