Coding Challenge - Removing Values from an Array

README.md

Coding Challenge - Removing Values from Array

Language / Framework

• Vanilla JavaScript

Attribution

This project derived from: Programming Challenges: [Remove False Values From Array]

Project Timeline

Notes I took for working on this coding challenge

• 2017-04-29 @ 11:43pm - 12:08am = 25 min

• + 5-10 min (refactoring) == 30-35 min Total

  • Although I stumbled quite a bit along the way, I did not resort to looking anything up.

• + 12:18am - 12:26am = 8 min === 40-45 min Grand Total

  • Added for adding .reduce() (which I did have to look up on MDN)

Project Details

Results provided in console output.

JavaScript Used:

• Array.fill()
• Array.map()
• Array.filter()
• Array.reduce() (had to look this up)
• Math

Overall project took about 45 min to fully complete.

This Code on CodePen

Learning Gotchas

Still struggling with writing core syntax from memory (without as much trial/error); Repetition.

coding-challenge-removing-falsies.js

// This project derived from:
// http://code.startupinacar.com/programming-challenges/
// Programming Challenges: [Remove False Values From Array]
// --- --- ---   --- --- ---   --- --- ---   --- --- ---

console.clear()

const arrayCount = 20 // Set a length for your array
const myArray = Array(arrayCount).fill(1).map( () => getRnd() ),
      myArray2T = myArray.filter( (key, val) => key === true ),
      myArray2F = myArray.filter( (key, val) => key === false ),
      myArray2R = myArray.reduce( (acc, val, idx, myArray) => {
          return val === true ? acc + 1 : acc
      })

console.log('Original Array:', myArray)
console.log('Filtered to True:', myArray2T.length, myArray2T)
console.log('Filtered to False:', myArray2F.length, myArray2F)
console.log('Reduced to True count:', myArray2R)

function getRnd() {
    return Math.round(Math.random(), 0) === 1 ? true : false
}