HTML and CSS Reference
In-Depth Information
Figure 12-11
Methods of javascript arrays
Array Method
Description
array
.concat(
array1
,
array2
,...)
Joins
array
to two or more arrays, creating a single
array containing the items from all the arrays.
array
.join(
separator
)
Joins all items in
array
into a single text string.
The array items are separated using the text in the
separator
parameter. If no separator is specified, a
comma is used.
array
.pop()
Removes the last item from
array
.
array
.push(
values
)
Appends
array
with new items, where
values
is a
comma-separated list of item values.
array
.reverse()
Reverses the order of items in
array
.
array
.shift()
Removes the first item from
array
.
array
.slice(
start
,
stop
)
Extracts the
array
items starting with the
start
index
up to the
stop
index, returning a new subarray.
array
.splice(
start
,
size
,
values
)
Extracts
size
items from
array
starting with the item
with the index
start
. To insert new items into the
array, specify the array items in a comma-separated
values
list.
Sorts
array
where
function
is the name of a function
that returns a positive, negative, or 0 value. If no func-
tion is specified,
array
is sorted in alphabetical order.
array
.sort(
function
)
array
.toString()
Converts the contents of
array
to a text string with the
array values in a comma-separated list.
array
.unshift(
values
)
Inserts new items at the start of
array
, where
values
is a comma-separated list of new values.
You set up the first parts of the online calendar in this session. In the next session, you'll
complete the monthly calendar by working with loops and conditional statements.
Session 12.1 Quick Check
1.
What is an array?
2.
Provide a command to create an array named
dayNames
using the object con-
structor form.
3.
Provide a command to create and populate the
dayNames
array with the abbre-
viations of the seven days of the week (starting with
Sun
and going through
Sat
).
Use the array literal form.
4.
Provide a command to return the third value from the
dayNames
array.
5.
Provide a command to sort the
dayNames
array in alphabetical order.
6.
Provide a command to extract the middle five values from the
dayNames
array.
7.
Provide a command to create a multidimensional array named
myArray
for the
following matrix:
3
0
-
2
12
-
8
1
4
1
-
3
