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hashset in javascript

YOU.com answered on January 19, 2021 Popularity 9/10 Helpfulness 1/10

answer hashset in javascript

related hashset in javascript

hashset in javascript

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class HashSet {
  constructor() {
    this.set = {};
  }

  add(item) {
    const stringifiedItem = JSON.stringify(item);
    this.set[stringifiedItem] = true;
  }

  delete(item) {
    const stringifiedItem = JSON.stringify(item);
    delete this.set[stringifiedItem];
  }

  has(item) {
    const stringifiedItem = JSON.stringify(item);
    return this.set.hasOwnProperty(stringifiedItem);
  }

  size() {
    return Object.keys(this.set).length;
  }

  values() {
    return Object.keys(this.set).map(key => JSON.parse(key));
  }
}

// Usage example:
const mySet = new HashSet();
mySet.add(5);
mySet.add("Hello");
mySet.add({ name: "John" });

console.log(mySet.has("Hello")); // Output: true
console.log(mySet.size()); // Output: 3
console.log(mySet.values()); // Output: [5, "Hello", { name: "John" }]

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: Grepper

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Contributed on Sep 12 2023

YOU.com

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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

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: developer.mozilla.org

Tags: hashset

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Contributed on Jan 19 2021

Confused Civet

0 Answers Avg Quality 2/10

hashset in javascript

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