line reverser

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Jul 22nd, 2023

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JavaScript 1.41 KB | Source Code | 0 0

function line_reverser(input) {
/* initialize variables */
var input_string = "";
var output_string = "";
/* exit if input is not a string or number; single-line texts or numbers will return as same text */
if (typeof(input) != "string" && typeof(input) != "number") return false;
else input_string = input;
line_reverser_last_input = input;
if (typeof(input) == "number") return input;
while (input_string.search(/\n/) > -1 || input_string.length > 0) /* repeat until no more line breaks */ {
/* determine length of first line */
var line_1_length=input_string.search(/\n/);
if(line_1_length == -1) /* no new lines exist */ {
line_1_length = input_string.length;
}
/* put text of first line in a variable */
var line_1=input_string.substring(0,line_1_length);
/* build variable with reversed lines; prevent adding a blank line at the end */
if (output_string.length == 0) output_string = line_1;
else output_string = line_1 + "\n" + output_string;
/* cut off first line and the first line feed from input string */
input_string = input_string.substring(line_1_length+1);
}
/* memorize last output for later use */
line_reverser_last_output = output_string;
return output_string;
}
/* initializing blank string variables to memorize last inputs and outputs for later use */
var line_reverser_last_input = "";
var line_reverser_last_output = "";

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