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My profile |Log out let mySet = new Set() mySet.add(1) // Set [ 1 ] mySet.add(5) // Set [ 1, 5 ] mySet.add(5) // Set [ 1, 5 ] mySet.add('some text') // Set [ 1, 5, 'some text' ] let o = {a: 1, b: 2} mySet.add(o) mySet.add({a: 1, b: 2}) // o is referencing a different object, so this is okay mySet.has(1) // true mySet.has(3) // false, since 3 has not been added to the set mySet.has(5) // true mySet.has(Math.sqrt(25)) // true mySet.has('Some Text'.toLowerCase()) // true mySet.has(o) // true mySet.size // 5 mySet.delete(5) // removes 5 from the set mySet.has(5) // false, 5 has been removed mySet.size // 4, since we just removed one value console.log(mySet) // logs Set(4) [ 1, "some text", {…}, {…} ] in Firefox // logs Set(4) { 1, "some text", {…}, {…} } in Chrome Iterating Sets // iterate over items in set // logs the items in the order: 1, "some text", {"a": 1, "b": 2}, {"a": 1, "b": 2} for (let item of mySet) console.log(item) // logs the items in the order: 1, "some text", {"a": 1, "b": 2}, {"a": 1, "b": 2} for (let item of mySet.keys()) console.log(item) // logs the items in the order: 1, "some text", {"a": 1, "b": 2}, {"a": 1, "b": 2} for (let item of mySet.values()) console.log(item) // logs the items in the order: 1, "some text", {"a": 1, "b": 2}, {"a": 1, "b": 2} // (key and value are the same here) for (let [key, value] of mySet.entries()) console.log(key) // convert Set object to an Array object, with Array.from let myArr = Array.from(mySet) // [1, "some text", {"a": 1, "b": 2}, {"a": 1, "b": 2}] // the following will also work if run in an HTML document mySet.add(document.body) mySet.has(document.querySelector('body')) // true // converting between Set and Array mySet2 = new Set([1, 2, 3, 4]) mySet2.size // 4 [...mySet2] // [1, 2, 3, 4] // intersect can be simulated via let intersection = new Set([...set1].filter(x => set2.has(x))) // difference can be simulated via let difference = new Set([...set1].filter(x => !set2.has(x))) // Iterate set entries with forEach() mySet.forEach(function(value) { console.log(value) }) // 1 // 2 // 3 // 4 Implementing basic set operations function isSuperset(set, subset) { for (let elem of subset) { if (!set.has(elem)) { return false } } return true } function union(setA, setB) { let _union = new Set(setA) for (let elem of setB) { _union.add(elem) } return _union } function intersection(setA, setB) { let _intersection = new Set() for (let elem of setB) { if (setA.has(elem)) { _intersection.add(elem) } } return _intersection } function symmetricDifference(setA, setB) { let _difference = new Set(setA) for (let elem of setB) { if (_difference.has(elem)) { _difference.delete(elem) } else { _difference.add(elem) } } return _difference } function difference(setA, setB) { let _difference = new Set(setA) for (let elem of setB) { _difference.delete(elem) } return _difference } // Examples let setA = new Set([1, 2, 3, 4]) let setB = new Set([2, 3]) let setC = new Set([3, 4, 5, 6]) isSuperset(setA, setB) // => true union(setA, setC) // => Set [1, 2, 3, 4, 5, 6] intersection(setA, setC) // => Set [3, 4] symmetricDifference(setA, setC) // => Set [1, 2, 5, 6] difference(setA, setC)

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