interview-practice.js

var numbers = [1,2,3,4,5,6,7,8,9,10];

var letters = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n',
               'o','p','q','r','s','t','u','v','w','x','y','z'];

// Practice Problems:
//-------------------
// Use the higherOrderFunctions to solve the following problems:

// Use filter to return just the vowels from the array letters
filter(letters, function(letter) {
  // your code here
  return ["a","e","i","o","u"].indexOf(letter) != -1;;
});

// Use filter to return everything that is not equal to the last element of the collection
filter(numbers, function(element) {
  // your code here
  return element != numbers[numbers.length-1];
});


// Use each to print the odd numbers to the console
each(numbers, function(number) {
  // your code here
});


// Use reduce to return the sum of numbers
reduce(numbers, function(sum, number) {
  // your code here
});


// Use map to convert the array letters to all capital letters
map(letters, function(letter) {
  // your code here
});


// Use filter to return every other letter in letters
filter(letters, function(letter) {
  // your code here
});


// Modify the above function to return the other letters
filter(letters, function(letter) {
  // your code here
});


// Use filter to return the string "lmnop" from letters
filter(letters, function(letter) {
  // your code here
}) // HINT: more code here


// Return the sum of the even numbers using filter and reduce together
// NO HINTS: All of your code here

var nestedArray = [ [3,7,5,9], [8,5,6,3,9], [9,5,1], [8,4,2,0] ]

// Use filter to return an array of arrays where the first element of each sub-array
// is greater than the last element of that sub-array

filter(nestedArray, function(element) {
  // your code here
  return element[0] > element[element.length-1];
})

// Use filter to return an array of arrays where each element in the sub-array
// is an odd number

filter(nestedArray, function(element) {
  // your code here
}

// Use map and reduce to return an array that contains the sum of each sub array
// No hints: your code here