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each_line 

        # String.each_line

(from ruby core)
---
    str.each_line(separator=$/, chomp: false) {|substr| block } -> str
    str.each_line(separator=$/, chomp: false)                   -> an_enumerator

---

Splits *str* using the supplied parameter as the record separator (`$/`
by default), passing each substring in turn to the supplied block.  If a
zero-length record separator is supplied, the string is split into
paragraphs delimited by multiple successive newlines.

If `chomp` is `true`, `separator` will be removed from the end of each
line.

If no block is given, an enumerator is returned instead.

    "hello\nworld".each_line {|s| p s}
    # prints:
    #   "hello\n"
    #   "world"

    "hello\nworld".each_line('l') {|s| p s}
    # prints:
    #   "hel"
    #   "l"
    #   "o\nworl"
    #   "d"

    "hello\n\n\nworld".each_line('') {|s| p s}
    # prints
    #   "hello\n\n"
    #   "world"

    "hello\nworld".each_line(chomp: true) {|s| p s}
    # prints:
    #   "hello"
    #   "world"

    "hello\nworld".each_line('l', chomp: true) {|s| p s}
    # prints:
    #   "he"
    #   ""
    #   "o\nwor"
    #   "d"

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