Reference · Files and processes

read_line

read_line() -> str | null | error(str)

What it does

The next line a script is given, without its line break, or null at the end of what is piped in. A loop of read_line() reads a file of any size a line at a time.

Examples

// quillo run upper.qwe < notes.txtlet line = read_line()while line != null {    print(upper(line))    line = read_line()}

Edge cases

• A \r\n ending is taken off as \n is; an empty line is "", not null.
• The last line counts with or without a line break after it.
• From a terminal it waits for a line to be typed.

Errors

As stdin, it is for a script: in a program that serves it is a runtime error.

Chaining

None: it takes nothing.

See also

stdin, exit, args

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