Distinct indices

containsCloseNums.js

// Given an array of integers nums and an integer k, determine whether there are two distinct indices i and j in the array where nums[i] = nums[j] and the absolute difference between i and j is less than or equal to k.

// Example

// For nums = [0, 1, 2, 3, 5, 2] and k = 3, the output should be
// containsCloseNums(nums, k) = true.

// There are two 2s in nums, and the absolute difference between their positions is exactly 3.

// For nums = [0, 1, 2, 3, 5, 2] and k = 2, the output should be
// containsCloseNums(nums, k) = false.

// The absolute difference between the positions of the two 2s is 3, which is more than k.

function containsCloseNums(nums, k) {
    
    let map = new Map()
    
    for(let i=0; i < nums.length; i++){
        if(map.get(nums[i])!==null && i - map.get(nums[i]) <= k){
            return true      
        }
        map.set(nums[i], i)
        
    }
    return false   
}