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I have a hash collection:
my_hash = {"1" => "apple", "2" => "bee", "3" => "cat"}
What syntax would I use to replace the first occurrence of the key with hash collection value in a string?
eg my input string:
str = I want a 3
The resulting string would be:
str = I want a cat
875
Ruby allows part of a string to be modified through the use of the []= method. To use this method, simply pass through the string of characters to be replaced to the method and assign the new string.
Modifying hashes in Ruby: Hash can be modified by adding or deleting a key value/pair in an already existing hash. Also, you can change the existing value of key in the hash.
Ruby | Hash store() methodHash#store() is a Hash class method that returns an add-on value with the key given by the key-value argument. Return: add on value with the key given by the key-value argument.
Most commonly, a hash is created using symbols as keys and any data types as values. All key-value pairs in a hash are surrounded by curly braces {} and comma separated. Hashes can be created with two syntaxes. The older syntax comes with a => sign to separate the key and the value.
My one liner:
hash.each { |k, v| str[k] &&= v }
or using String#sub! method:
hash.each { |k, v| str.sub!(k, v) }
"I want a %{b}" % {c: "apple", b: "bee", a: "cat"}
=> "I want a bee"
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