Count Unique Values

countUniqueValues.js

(()=>{
  function countUniqueValues(sortedArray) {
    const myArray = sortedArray.slice(0)

	let count = 0

    myArray.forEach((num, i) => {
	  const rightNum = myArray[i + 1]

      if (myArray[count] !== rightNum) {
        count++

        if (rightNum !== undefined) {
          myArray[count] = rightNum
        }
      }
    })

    return count
  }

  const sArray = [1,1,2,2,3,3,4,5]

  const uValCount = countUniqueValues(sArray)

  console.log(uValCount)
  console.log(sArray)
  
})()

// Can we mutate the input? YES

// Set up left pointer

// Loop input
  // Set up  right number

  // Do nothing, unless left & right do not match
    // Move left forward

    // If right is defined
      // update input's left index with the right number


// return left pointer