Deleting an item from a list in Java

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Deleting an item from a list
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Deleting an item from a list is as simple as inserting it, as the following example shows:
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<cfset myList = a,b,c,d > <cfset myList = ListDeleteAt(myList, 2)>
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That call to ListDeleteAt() removes the second item from the list, so myList now contains a,c,d . To use a delimiter other than the comma, you need to add a third argument to the function call, as follows:
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<cfset myList = a;b;c;d > <cfset myList = ListDeleteAt(myList, 2, ; )> myList now contains a;c;d .
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Finding an item in a list
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Now that you know how to add and remove items from a list, you can look at how to search existing lists to find a particular item. Say, for example, that you wanted to find apple in the following list:
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<cfset myList = pear,apple,orange,banana >
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You use ListFind() to locate the position of apple in myList, as follows:
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<cfset pos = ListFind(myList, apple )> pos would contain 2, because apple is the second item in the list. Suppose, however, that
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you use the following instead:
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<cfset pos = ListFind(myList, tangerine )> pos would contain 0, since tangerine does not exist in myList.
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What if myList contained mixed-case items, as follows:
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<cfset myList = Pear,Apple,Orange,Banana >
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Calling ListFind(myList, apple ) would return 0 this time, because ListFind() is a case-sensitive match. To find a list item regardless of its case, call ListFindNoCase(), as follows:
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<cfset pos = ListFindNoCase(myList, apple )>
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Now pos would contain 2 again because ListFindNoCase() performs a case-insensitive match. You can also match a substring of a list item. Take, for example, the following code:
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<cfset pos = ListContains(myList, ple )>
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Here, pos would return 2, because apple is the first list item that contains the substring ple. As is ListFind(), ListContains() is case-sensitive, but a case-insensitive version also is available, as follows:
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<cfset pos = ListContainsNoCase(myList, ple )>
This code would match Apple, apple, and apPLe. Suppose, however, that your list contains multiple delimiters, as follows:
<cfset myList = pear,apple:orange;banana >
In this version of myList, commas, semicolons, and colons can all be delimiters, so to call ListFind() on this function, you must use the extra delimiter argument, as follows:
<cfset pos = ListFind(myList, apple , :;, )>
Notice that the extra argument contains more than one delimiter, so ColdFusion treats any of these characters as delimiters.
Getting an item from a list by the item s index
You haven t seen it for a while (well, at least not since the beginning of the preceding section), so you may need to take another look at the example list, as follows:
<cfset myList = pear,apple,orange,banana > ListGetAt() retrieves the item at a particular position in a list: <cfset item = ListGetAt(myList, 2)>
In that example, item would contain apple, because that is the second item in the list.
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The following code is a shortcut to retrieving the first and last items in a list:
<cfset firstItem = ListFirst(myList)> <cfset lastItem = ListLast(myList)>
In this example, firstItem would contain pear, and lastItem would contain banana. You also have a function to get every list item except the first, as follows:
<cfset subList = ListRest(myList)>
After calling ListRest(), subList would contain apple,orange,banana. ListRest() is useful for peeling off the first values of a list inside a list loop and then setting the list to the remaining items.
GetToken() vs. ListGetAt()
You learn in the preceding sections about ListGetAt(), which retrieves the item at a specific index in a list. Another function, called GetToken(),does the same thing, as the following example shows:
<cfset myList = pear,apple,orange,banana > <cfset item = GetToken(myList, 2, , )> GetToken() returns apple, the second item in the list. Notice, however, that we use the delimiter argument even though the delimiter is a comma. GetToken() uses spaces, tabs, and newlines, instead of commas, as the default delimiter.
The advantage to using GetToken() is that GetToken() doesn t throw an error if the index is outside the bounds of the list. Try, for example, calling the following:
<cfset item = ListGetAt(myList, 5)>
This call would cause ColdFusion to throw an error because there only four elements are in myList. Try, however, calling GetToken() instead, as follows:
<cfset item = GetToken(myList, 5, , )>
This call would simply return an empty string and not throw an error. You should usually use ListGetAt() because its syntax is simpler and it is easier to read. If you don t know for sure how many elements may be in a list, however, use GetToken() to avoid throwing an error and then test the return value for an empty string to determine whether it was successful.