JavaScript Array method: indexOf()
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The indexOf() method (when applied to a JavaScript
array) returns
the index of the first element of an array found when an array is searched.
It
has the following syntax with the following parameters. It returns a number
as above (or -1 if no array element passes the test).
array.indexOf(item, start)
|
Parameter
|
Required / Optional
|
Description
|
|
item
|
Required
|
Item to search for
|
|
start
|
Optional
|
Index value at which to
start search. Negative values indicate start from a position counting back
from the end and then search to the end
|
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