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Ruby v Perl - interpollating variables
When printing in Perl, you can drop a variable into a double quoted string ant it will be interpretter for you:
If you want to perform an operation on the variable, though, it's not as easy - you have to come out of the double quoted string, do the calculation, then start another string:
In Ruby, variable names do NOT start with a $ so you can't simply drop them in to your double quoted string. Instead, you can write #{expression} within the double quotes and that gives you ...
And that's fabulous - it gives you the ability to write any expresion you want, or just a simple variable, with a double quoted string and have the same simple syntax for both.
(written 2006-12-15 04:57:25)
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.
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"--- $number ---"If you want to perform an operation on the variable, though, it's not as easy - you have to come out of the double quoted string, do the calculation, then start another string:
"--- ",$number + 1," ---"In Ruby, variable names do NOT start with a $ so you can't simply drop them in to your double quoted string. Instead, you can write #{expression} within the double quotes and that gives you ...
"--- #{number + 1} ---"And that's fabulous - it gives you the ability to write any expresion you want, or just a simple variable, with a double quoted string and have the same simple syntax for both.
(written 2006-12-15 04:57:25)
Associated topics are indexed under
R109 - Ruby - Strings and Regular ExpressionsP205 - Perl - Initial String Handling
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Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).
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