Join. Strings are everywhere in programs. And programs themselves are represented as strings. An array can contain strings—or it can be merged into a single string with delimiters.
Method notes. Join() acts on string arrays (or arrays of any type of element that are converted into strings). We can use join to round-trip our data with split().
An example program. Consider this program. We see a string array that contains three string literals. On the string array instance we call join.
And We specify a semicolon delimiter. The string values are merged into a single string, with a semicolon between each pair.
values = ["aa", "bb", "cc"]
# Use the join method to combine a string array.
joined = values.join(";")
# Print the result.
puts joinedaa;bb;cc
No delimiter. We can use join with no delimiter. This converts an array of strings (or 1-char strings which are like characters) into a string.
values = ["a", "b", "c"]
# Join with no delimiter.# ... This turns an array of characters into a string.
result = values.join
puts resultabc
A review. With split() and join() we can round-trip our data processing. We have a string, and can split it apart. Then we modify elements, and join it together again.
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
