Function main

javascript_games/ninetyninebottles2.js:34–96

()

async function main() {
    console.log('niNety-nniinE BoOttels, by Al Sweigart al@inventwithpython.com');
    console.log();
    console.log('(Press Ctrl-C to quit.)');

    await sleep(2);

    let bottles = 99;  // This is the starting number of bottles.

    // This list holds the string used for the lyrics:
    let lines = [' bottles of milk on the wall,',
             ' bottles of milk,',
             'Take one down, pass it around,',
             ' bottles of milk on the wall!'];

    while (bottles > 0) {  // Keep looping and display the lyrics.
        await slowPrint(bottles.toString() + lines[0], SPEED)
        await sleep(LINE_PAUSE);
        await slowPrint(bottles.toString() + lines[1], SPEED)
        await sleep(LINE_PAUSE);
        await slowPrint(lines[2], SPEED)
        await sleep(LINE_PAUSE);
        bottles = bottles - 1 ; // Decrease the number of bottles by one.

        if (bottles > 0) {  // Print the last line of the current stanza.
            await slowPrint(bottles.toString() + lines[3], SPEED)
        } else {  // Print the last line of the entire song.
            await slowPrint('No more bottles of milk on the wall!', SPEED)
        }

        await sleep(LINE_PAUSE);
        console.log();  // Print a newline.

        // Choose a random line to make "sillier":
        let lineNum = Math.floor(Math.random() * 4);

        let line = lines[lineNum];
        let effect = Math.floor(Math.random() * 4);

        if (effect === 0) {  // Replace a character with a space.
            let charIndex = Math.floor(Math.random() * line.length);
            line = replaceAt(line, charIndex, ' ');
        } else if (effect === 1) {  // Change the casing of a character.
            let charIndex = Math.floor(Math.random() * line.length);
            if (line[charIndex].toUpperCase() == line[charIndex]) {
                line = replaceAt(line, charIndex, line[charIndex].toLowerCase());
            } else if (line[charIndex].toLowerCase() == line[charIndex]) {
                line = replaceAt(line, charIndex, line[charIndex].toUpperCase());
            }
        } else if (effect === 2) {  // Transpose two characters.
            let charIndex = Math.floor(Math.random() * (line.length - 1));
            let firstChar = line[charIndex]
            let secondChar = line[charIndex + 1]
            line = replaceAt(line, charIndex, secondChar);
            line = replaceAt(line, charIndex + 1, firstChar);
        } else if (effect === 3) {  // Double a character.
            let charIndex = Math.floor(Math.random() * (line.length - 1));
            line = line.substr(0, charIndex) + line[charIndex] + line.substr(charIndex);