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41 lines
780 B
41 lines
780 B
'use strict'; |
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const internals = {}; |
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module.exports = function (array1, array2, options = {}) { |
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if (!array1 || |
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!array2) { |
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return (options.first ? null : []); |
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} |
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const common = []; |
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const hash = (Array.isArray(array1) ? new Set(array1) : array1); |
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const found = new Set(); |
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for (const value of array2) { |
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if (internals.has(hash, value) && |
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!found.has(value)) { |
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if (options.first) { |
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return value; |
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} |
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common.push(value); |
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found.add(value); |
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} |
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} |
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return (options.first ? null : common); |
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}; |
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internals.has = function (ref, key) { |
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if (typeof ref.has === 'function') { |
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return ref.has(key); |
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} |
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return ref[key] !== undefined; |
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};
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