Using ZeroLib¶
In this chapter we will learn how to use the ZeroLib library.
Introduction¶
ZeroLib is a simple library written in Ring.
The library provideds classes for Lists and String where the index starts from 0.
ZeroBasedList Class¶
Simple class provide a List where the index starts from zero.
Methods:
| Method | Description/Output |
|---|---|
| Init(List) | |
| Add(Value) | Add item to the list |
| Insert(nIndex,Value) | Inset Item after nIndex |
| Find(Value) | Find item |
| Delete(nIndex) | Delete item from the list |
| Item(nIndex) | Get item from the list |
| First() | Get the first item in the list |
| Last() | Get the last item in the list |
| Set(nIndex,Value) | Set item value |
| FindInColumn(nCol,Value) | Find item in a column |
| Sort() | Sort items - return new list |
| Reverse() | Reverse items - return new list |
| Swap(nIndex1,nIndex2) | Swap two items |
Example:
load "zerolib.ring"
? "Using List - Index start from 0"
List = Z( [1,2,3] )
List.Add(4)
List.Add(5)
? List[0]
? List[1]
? List[2]
? List[3]
? List[4]
nIndex = List.find(2)
? "Find(2) = " + nIndex
List.delete(0)
? "After deleting the first item : List[0]"
? "Now List[0] = " + List[0]
Output:
Using List - Index start from 0
1
2
3
4
5
Find(2) = 1
After deleting the first item : List[0]
Now List[0] = 2
ZeroBasedString Class¶
Simple class provide a String where the index starts from zero.
| Method | Description/Output |
|---|---|
| Init(String|Number) | |
| Lower() | New String - Lower case characters |
| Upper() | New String - Upper case characters |
| Left(x) | New String - contains x characters from the left |
| Right(x) | New String - contains x characters from the right |
| Lines() | Number - Lines count |
| Trim() | New String - Remove Spaces |
| Copy(x) | New String - repeat string x times |
| strcmp(cString) | Compare string with cString |
| tolist() | List (String Lines to String Items) |
| tofile(cFileName) | Write string to file |
| mid(nPos1,nPos2) | New String - from nPos1 to nPos2 |
| getfrom(nPos1) | New String - from nPos1 to the end of the string |
| replace(cStr1,cStr2,lCase) | New String - Replace cStr1 with cStr2 , lCase (True=Match Case) |
| split() | List - Each Word as list item |
| startswith(substring) | Return true if the start starts with a substring |
| endswith(substring) | Return true if the start ends with a substring |
Example:
load "zerolib.ring"
? "Using String - Index start from 0"
String = Z( "Welcome" )
? String[0]
? String[1]
? String[2]
? String[3]
? String[4]
? String[5]
? String[6]
Output:
Using String - Index start from 0
W
e
l
c
o
m
e
Source Code¶
We can find the library source code in this folder
URL : https://github.com/ring-lang/ring/tree/master/ringlibs/zerolib