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Code This #4: Remove Duplicates

 3 years ago
source link: https://dev.to/frontendengineer/code-this-4-remove-duplicates-13m5
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Job Interview Question And Answer (7 Part Series)

Interview Question #4:

Write a function that will remove duplicate in an array.🤔❓ You can get a variation of this question as Get unique characters from a list.

If you need practice, try to solve this on your own. I have included 2 potential solutions below.

Note: There are many other potential solutions to this problem.

Feel free to bookmark 🔖 even if you don't need this for now. You may need to refresh/review down the road when it is time for you to look for a new role.

Code: https://codepen.io/angelo_jin/pen/PojPRzQ

Solution #1: ES6 Set

  • uses the elegance of Set just like other programming languages. A value in the Set may only occur once; it is unique in the Set's collection. 
function removeDuplicates(array) {
  return [...new Set(array)]
}
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Solution #2: Object

  • below will use a js plain object to store key value pairs. Value can be other values as well, i chose to increment it so we may use it for other purpose like get the total count for a characters, etc. 
function removeDuplicates(array) {
  const map = {}

  for (const char of array) {
    if (map[char]) {
      map[char]++
    } else {
       map[char] = 1
    }
  }

  return Object.keys(map)
}
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In case you like a video instead of bunch of code 👍😊

Happy coding and good luck if you are interviewing!

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