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This is what I want to do, but with a one-liner, if possible:
lines = Array.new File.open('test.txt').each { |line| lines << line } Possible?
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The standard way of reading a line of text in C is to use the fgets function, which is fine if you know in advance how long a line of text could be.
Python read file line by line into arrayAn empty array is defined and the argument is opened as f and to read the line. The for line in f is used and to append the line into the array, array. append is used. The fruits file is passed as the parameter in the function.
Method 1: Read a File Line by Line using readlines() readlines() is used to read all the lines at a single go and then return them as each line a string element in a list. This function can be used for small files, as it reads the whole file content to the memory, then split it into separate lines.
Do as below :
File.readlines('test.txt') Read documentation :
arup@linux-wzza:~> ri IO::readlines = IO::readlines (from ruby site) ------------------------------------------------------------------------------ IO.readlines(name, sep=$/ [, open_args]) -> array IO.readlines(name, limit [, open_args]) -> array IO.readlines(name, sep, limit [, open_args]) -> array ------------------------------------------------------------------------------ Reads the entire file specified by name as individual lines, and returns those lines in an array. Lines are separated by sep. a = IO.readlines("testfile") a[0] #=> "This is line one\n" If the last argument is a hash, it's the keyword argument to open. See IO.read for detail. Example
arup@linux-wzza:~/Ruby> cat out.txt name,age,location Ram,12, UK Jadu,11, USA arup@linux-wzza:~/Ruby> ruby -e "p File::readlines('./out.txt')" ["name,age,location\n", "Ram,12, UK\n", "Jadu,11, USA\n"] arup@linux-wzza:~/Ruby> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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