93 lines
2.0 KiB
JavaScript
93 lines
2.0 KiB
JavaScript
// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/perform-a-subset-check-on-two-sets-of-data
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class Set {
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constructor() {
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// This will hold the set
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this.dictionary = {};
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this.length = 0;
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}
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// This method will check for the presence of an element and return true or false
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has(element) {
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return this.dictionary[element] !== undefined;
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}
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// This method will return all the values in the set
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values() {
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return Object.keys(this.dictionary);
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}
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// This method will add an element to the set
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add(element) {
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if (!this.has(element)) {
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this.dictionary[element] = true;
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this.length++;
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return true;
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}
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return false;
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}
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// This method will remove an element from a set
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remove(element) {
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if (this.has(element)) {
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delete this.dictionary[element];
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this.length--;
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return true;
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}
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return false;
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}
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// This method will return the size of the set
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size() {
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return this.length;
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}
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// This is our union method
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union(set) {
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const newSet = new Set();
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this.values().forEach((value) => {
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newSet.add(value);
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});
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set.values().forEach((value) => {
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newSet.add(value);
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});
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return newSet;
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}
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// This is our intersection method
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intersection(set) {
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const newSet = new Set();
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let largeSet;
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let smallSet;
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if (this.dictionary.length > set.length) {
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largeSet = this;
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smallSet = set;
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} else {
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largeSet = set;
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smallSet = this;
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}
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smallSet.values().forEach((value) => {
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if (largeSet.dictionary[value]) {
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newSet.add(value);
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}
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});
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return newSet;
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}
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difference(set) {
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const newSet = new Set();
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this.values().forEach((value) => {
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if (!set.dictionary[value]) {
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newSet.add(value);
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}
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});
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return newSet;
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}
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// Only change code below this line
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isSubsetOf(otherSet) {
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return this.values().every((item) => otherSet.has(item));
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}
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// Only change code above this line
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}
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