Substring/Top and tail: Difference between revisions
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=={{header|J}}== |
=={{header|J}}== |
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The monadic primitives <code>}.</code> (Behead) and <code>}:</code> (Curtail). |
The monadic primitives <code>}.</code> ([http://http://www.jsoftware.com/help/dictionary/d531.htm Behead]) and <code>}:</code> ([http://www.jsoftware.com/help/dictionary/d532.htm Curtail]) are useful for this task. |
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'''Example use:'''<br> |
'''Example use:'''<br> |
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}:@}. 'brooms' NB. drop first and last items |
}:@}. 'brooms' NB. drop first and last items |
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room</lang> |
room</lang> |
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=={{header|JavaScript}}== |
=={{header|JavaScript}}== |
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Revision as of 12:42, 6 June 2011
The task is to demonstrate how to remove the first and last characters from a string. The solution should demonstrate how to obtain the following results:
- String with first character removed
- String with last character removed
- String with both the first and last characters removed
J
The monadic primitives }.
(Behead) and }:
(Curtail) are useful for this task.
Example use:
<lang j> }. 'knight' NB. drop first item
night
}: 'socks' NB. drop last item
sock
}:@}. 'brooms' NB. drop first and last items
room</lang>
JavaScript
<lang javascript>alert("knight".slice(1)); // strip first character alert("socks".slice(0, -1)); // strip last character alert("brooms".slice(1, -1)); // strip both first and last characters</lang>
Perl
<lang perl>print substr("knight",1), "\n"; # strip first character print substr("socks", 0, -1), "\n"; # strip last character print substr("brooms", 1, -1), "\n"; # strip both first and last characters</lang>
In perl, we can also remove the last character from a string variable with the chop function:
<lang perl>$string = 'ouch'; $bits = chop($string); # The last letter is returned by the chop function print $bits; # h print $string; # ouc # See we really did chop the last letter off</lang>
PHP
<lang php><?php echo substr("knight", 1), "\n"; // strip first character echo substr("socks", 0, -1), "\n"; // strip last character echo substr("brooms", 1, -1), "\n"; // strip both first and last characters ?></lang>
PureBasic
<lang PureBasic>If OpenConsole()
PrintN(Right("knight", Len("knight") - 1)) ;strip the first letter PrintN(Left("socks", Len("socks")- 1)) ;strip the last letter PrintN(Mid("brooms", 2, Len("brooms") - 2)) ;strip both the first and last letter Print(#CRLF$ + #CRLF$ + "Press ENTER to exit"): Input() CloseConsole()
EndIf</lang> Sample output:
night sock room
Python
<lang python>print "knight"[1:] # strip first character print "socks"[:-1] # strip last character print "brooms"[1:-1] # strip both first and last characters</lang>
Ruby
<lang ruby>puts "knight"[1..-1] # strip first character puts "socks"[0..-2] # strip last character puts "socks".chop # alternate way to strip last character puts "brooms"[1..-2] # strip both first and last characters</lang>
ZX Spectrum Basic
<lang zxbasic>10 PRINT FN f$("knight"): REM strip the first letter 20 PRINT FN l$("socks"): REM strip the last letter 30 PRINT FN b$("brooms"): REM strip both the first and last letter 100 STOP
9000 DEF FN f$(a$)=a$(2 TO LEN(a$)) 9010 DEF FN l$(a$)=a$(1 TO LEN(a$)-(1 AND (LEN(a$)>=1))) 9020 DEF FN b$(a$)=FN l$(FN f$(a$)) </lang>