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SEval Function

Execute a code block for each of the individual characters in a string.

Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.19

Syntax

Copy

 FUNCTION SEval(
	cString,
	cbBlock,
	nStart,
	nCount
) AS STRING CLIPPER

[ClipperCallingConventionAttribute(new string[] { ... })]
public static string SEval(
	Usual cString = default,
	Usual cbBlock = default,
	Usual nStart = default,
	Usual nCount = default
)

Request Example View Source

Parameters

cString (Optional): Type: Usual
The string to scan.
cbBlock (Optional): Type: Usual
The code block to execute for each character encountered.
nStart (Optional): Type: Usual
The starting character.
A negative value starts from the end.
The default value is 1 if nCount is positive and
The length of cString if nCount is negative.
nCount (Optional): Type: Usual
The number of characters to process from nStart.
A negative value steps downward.
The default is all characters to the end of the string.

Return Value

Type: String
A string of characters that have been processed by the code block.

Remarks

SEval() is a character function that evaluates a code block once for each character in a string, passing the ASCII value and the character index as arguments.
The return value of the code block is ignored.
All characters in cString are processed unless either the nStart or the nCount argument is specified.

Examples

This example uses SEval() to extract the street number from a string containing the complete street address:

Copy

1LOCAL cStreetNumber AS STRING
2LOCAL cAddress AS STRING
3cStreetNumber := NULL_STRING
4cAddress := "1209 West Golden Lane"
5SEval(cAddress, ;
6        {|c| cStreetNumber += ;
7        If(IsDigit(Chr(c)), Chr(c), NULL_STRING)})
8? cStreetNumber                        // 1209

Reference

Functions, Globals and Defines

XSharp.RT Namespace

AEval

DbEval(Usual, Usual, Usual, Usual, Usual, Usual, Usual)

Eval

QOut

SEvalA(Usual, Usual, Usual, Usual)