anubhawm/choose-random

ChooseRandom Assignment

Students are to implement the chooseRandom function from the skeleton provided in lib.js. This function takes an array and the number of random items to choose from the array (numItems). It should return a new array containing the correct number of randomly selected, unique items from the original array. Students must export their createRandom function from the lib.js file in order to run the included test cases.

Goal

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Have students practice a more complex problem in JavaScript which will allow them to explore more features of the language than some of the fundamental code wars problems offer.

Tasks

• Implement chooseRandom function
• Should take 2 parameters, array and number
• array should default to an empty array
• If array has length 0 or 1, then simply return it
• numItems must be checked to ensure it is a in the range 1 to array.length (inclusive)
• If numItems is outside of the correct range, then it should be set to a random number within the correct range
• complete the skeleton for the randomIndices array
• randomIndices should be an array of length numItems and contain unique numbers between 0 and array.length-1 which represent the indices of array
• Filter array returning a new array containing only values which correlate to the indices included in randomIndices
• Should always return an array
• Should not mutate the array passed in
• Should return a random array if possible (size > 1)
• Should return an array of the passed in length
• Run command npm run test and ensure all tests pass successfully