String substitution in Ruby
Splitting Strings in Ruby Using the String split Method Splitting Strings in Ruby Using the String split Method Michael Morin is a computer programmer specializing in Linux and Ruby.
He has 30 years of experience studying, teaching and using the programming language.
Unless user input is a single word or number, that input will need to be or turned into a list of strings or numbers.
For instance, if a program asks for string to ruby code full name, including middle initial, it will first need to split that input into three separate before it can work with your individual first, middle and last name.
This is achieved using the String split method.
In its most basic form, String split takes a single argument: the field delimiter as a string.
This delimiter will be removed from the output and an array of strings split on the delimiter will source returned.
So, in the following example, assuming the user input their name correctly, you should receive a three-element Array from the split.
Also, note that name.
Morin Your first name is Michael Your last name is Morin However, String split is a bit smarter than you'd think.
If the argument to String split is a string, it does indeed use that as the delimiter, but if the argument pokemon omega ruby pokemon codes a string with a single space as we usedthen it infers that you want to split on any amount of whitespace and that you also want to remove any leading whitespace.
However, that's the only special case when you pass a String as the first argument.
Regular Expression Delimiters You can also pass a regular expression as the first argument.
Here, String split becomes a bit more flexible.
We can also make our little name splitting code a bit smarter.
We don't want the period at the end of the middle check this out />We know it's a middle initial, and the database won't want a period there, so we can remove it while we split.
When String split matches a regular expression, it does the same exact thing as if it had just matched a string delimiter: it takes it out of the output and splits it at that string to ruby code />It's a global, something you don't often see in Ruby, so if you change it, it might affect other parts of the code—just be sure to change it back when finished.
However, all this variable does is act as the default value for the first argument to String split.
By default, flaming crates slots variable seems to be set to nil.
However, if String split's first argument is nil, it will replace it with a single space string.
If the delimiter passed to String split is a zero-length string or regular expression, then String split will act a bit differently.
It will remove nothing at all from the original string and split on every character.
This essentially turns the string into an array of equal length containing only one-character strings, one for each character in the string.
This can be flaming crates slots for iterating over the string and was used in pre-1.
However, symbol ruby what you really want to do is iterate over a string, and you're using 1.
So back to our name parsing example, what if someone has a space in their last name?
For instance, Dutch surnames can often begin with "van" meaning "of" or "from".
We only really want a 3-elementso we can use the second argument to String split that we have so far ignored.
The second argument is expected to be a Fixnum.
If this argument is positive, at most, that many elements will be filled in the array.
So in our case, we would want to pass 3 for this argument.
Vincent Willem van Gogh Your first name is Vincent Your middle initial is Willem Your last name is van Gogh However, if this argument is negative any negative numberthen there will be no limit on the number of elements in the output array and any trailing delimiters will appear as zero-length strings at the end of the array.
Strings in Ruby
This page illustrates the Ruby Code Examples, in a straight way than to lengthy explanations, this can be used like an immediate reference for both syntax and programming ideas. Concise methods attempting a problem with a pragmatic approach are also discussed.
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