import Utils from "../Utils"; import Operation from "../Operation"; /** * Set Union operation */ class SetUnion extends Operation { /** * Set Union constructor */ constructor() { super(); this.name = "Set Union"; this.module = "Default"; this.description = "Get the union of two sets"; this.inputType = "string"; this.outputType = "string"; this.args = [ { name: "Sample delimiter", type: "binaryString", value: Utils.escapeHtml("\\n\\n") }, { name: "Item delimiter", type: "binaryString", value: "," }, ]; } /** * Validate input length * @param {Object[]} sets * @throws {Error} if not two sets */ validateSampleNumbers(sets) { if (!sets || (sets.length !== 2)) { throw "Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?"; } } /** * Run the union operation * @param input * @param args */ run(input, args) { [this.sampleDelim, this.itemDelimiter] = args; const sets = input.split(this.sampleDelim); try { this.validateSampleNumbers(sets); } catch (e) { return e; } return Utils.escapeHtml(this.runUnion(...sets.map(s => s.split(this.itemDelimiter)))); } /** * Get the union of the two sets. * * @param {Object[]} a * @param {Object[]} b * @returns {Object[]} */ runUnion(a, b) { const result = {}; /** * Only add non-existing items * @param {Object} hash */ const addUnique = (hash) => (item) => { if (!hash[item]) { hash[item] = true; } }; a.map(addUnique(result)); b.map(addUnique(result)); return Object.keys(result).join(this.itemDelimiter); } } export default SetUnion;