41 lines
986 B
JavaScript
41 lines
986 B
JavaScript
export default class DeepSet {
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constructor() {
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this.map = new Map()
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this.set = new Set()
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}
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_reduce(path) {
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return path.reduce((context, key) => {
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if (context.map.has(key)) {
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return context.map.get(key)
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} else {
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const newContext = new DeepSet()
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context.map.set(key, newContext)
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return newContext
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}
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}, this).set
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}
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has(values) {
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const { keys, value } = destruct(values)
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return this._reduce(keys).has(value)
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}
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add(values) {
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const { keys, value } = destruct(values)
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return this._reduce(keys).add(value)
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}
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}
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const destruct = xs => {
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switch (xs.length) {
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case 0:
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return { keys: [], value: undefined }
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case 1:
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return { keys: [], value: xs[0] }
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default:
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return { keys: xs.slice(0, xs.length - 1), value: xs.slice(-1)[0] }
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}
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} |