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01 Hash Table

/**
 *
 * Ashish Patel
 * e: ashishsushilPatel@gmail.com
 * w: https://ashish.me
 *
 */

class HashMap {
  constructor() {
    this.buckets = new Array(7)
  }

  hash(str) {
    str = str.toLowerCase()
    const ALPHABET = 'qwertyuiopasdfghjklzxcvbnm'
    let sum = 0
    for (let index = 0; index < str.length; index++) {
      sum += ALPHABET.indexOf(str.charAt(index))
    }
    console.log('hash:', str, sum)
    return sum
  }

  hashcode(key) {
    let index = this.hash(key) % this.buckets.length
    console.log("key: ", key, " index: ", index)
    return index
  }

  put(key, value) {
    let index = this.hashcode(key)
    this.buckets[index] = value
  }

  get(key) {
    let index = this.hashcode(key)
    return this.buckets[index]
  }

  remove(key) {
    let index = this.hashcode(key)
    this.buckets[index] = null
  }
}

let map = new HashMap()
map.put("Pune", 7.4)
map.put("Nagpur", 3.2)
map.put("Mumbai", 3.2)
map.put("Raipur", 6)
console.table(map.buckets)

console.log(map.get("Washington"))
console.log(map.get("Oregon"))

Created 2019-12-04T02:03:28+05:18 · Edit