Make array of objects from array of strings

Question

I have an array of strings read from file.

contents = File.readlines('foo.txt')

I can create an some object with string

my_foo = Foo.new("some_text")

I need to make an array of objects Foo made by array of strings contents. How can I do it?

Arup Rakshit · Accepted Answer · 2015-06-02 17:06:27Z

4

It may be worth to mention, that File.readlines will read everything into memory, what may cause memory issues with large files. Consider using this code:

File.foreach('foo.txt').map do |line|
  Foo.new(line)
end

It read file line by line, almost as fast as your code, but more secure.

edited Jun 2, 2015 at 17:06

Arup Rakshit

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answered May 19, 2015 at 18:22

djaszczurowski

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2 Comments

engineersmnky Over a year ago

why not foos = File.foreach('foo.txt').map { |line| Foo.new(line) } rather than declaring the Array and pushing into it?

djaszczurowski Over a year ago

@engineersmnky you are right, map is better. updated

rohit89 · Accepted Answer · 2015-05-19 18:01:33Z

3

Is this what your looking for?

contents.map {|i| Foo.new i}

answered May 19, 2015 at 18:01

rohit89

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