Arrays in Javascript

Assess your knowledge of arrays in Javascript by implementing the following functions.

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Assess your skills

Test your concepts of arrays by determining the location of an item in an array.

indexOf = function(arr, item) {
}

Evaluate your concepts by populating an array.

sum = function(arr) {
  
}

Evaluate yourself by returning a new array after removing all instances of a value from an array.

// Returns a new array
remove = function(arr, item) {
  
}

Evaluate yourself by removing all instances of a value from an array (modify the original array).

// Modifies the original array
removeWithoutCopy = function(arr, item) {
  
}

Evaluate yourself by adding an item to the end of an array.

// Appends to the original array
append = function(arr, item) {
  
}

Evaluate yourself by removing the last item of an array.

// Modifies the original array
truncate = function(arr) {
  
}

Test yourself by Adding an item at the beginning of an array.

// Prepends to the original array
prepend = function(arr, item) {
  
}

Test yourself by removing the first item of an array.

// Modifies the original array
curtail = function(arr) {
  
}

Test yourself by joining together two arrays.

// Returns a new array containg both arrays
concat = function(arr1, arr2) {
  
}

Test yourself by adding an item anywhere in an array.

// Inserts an element in the original array
insert = function(arr, item, index) {
  
}

Test yourself by counting the occurrences of an item in an array.

count = function(arr, item) {
  
}

Test yourself by finding the duplicates in an array

// return all elements that occur more than once
duplicates = function(arr) {
  
}

Test yourself by Squaring each number in an array.

// return a new array with each item squared
square = function(arr) {
  
}

Test yourself by finding all the occurrences of an item in an array.

// return a new array containing all indexes of all occurances of the target item
findAllOccurrences = function(arr, target) {
  
}

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