Arrays

Question 1

toString()

Answer 1

returns a string with the toString method called on each element, separated by commas

Question 2

concat(item1 [,item2, …])

Answer 2

returns a new array with the items added to it. works for single elements as well as other arrays

Question 3

join(sep)

Answer 3

converts an array to a string, and delimits values with the sep param. if sep not specified, it will use empty string to delimit.

Question 4

pop()

Answer 4

removes and returns the last value in the array

Question 5

push(item1, [,item2 …])

Answer 5

appends items to the end of the array

Question 6

shift()

Answer 6

removes and returns the first value in the array

Question 7

unshift(item1 [,item 2, …])

Answer 7

inserts items at the start of the array

Question 8

slice(start [, end])

Answer 8

returns a sub-array from index start to end. if end is not specified, the last index is the ‘end’

Question 9

sort([cmpfn])

Answer 9

sorts the array using the given comparison function

Question 10

splice(start, delcount, [, item1[, …]])

Answer 10

lets you modify an array by deleting a section and replacing it with more items

Question 11

reverse()

Answer 11

reverses a given array