LeetCode 217: Contains Duplicate

 Question

Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.

Example 1:

Input: nums = [1,2,3,1]
Output: true

Example 2:

Input: nums = [1,2,3,4]
Output: false

Example 3:

Input: nums = [1,1,1,3,3,4,3,2,4,2]
Output: true

Solutions

1) Go

func containsDuplicate(nums[]int) bool {

    dict:=make(map[int]int)

    for _,num:=range nums{

        dict[num]=dict[num]+1

        if(dict[num]>1){

            return true;

        }

       

    }

    return false

}

2) Javascript

function containsDuplicate(nums) {

  const temp = new Set(nums);

  return !(nums.length === temp.size);

}