Rosetta Code Challenges - Align columns

Rosetta Code
1

Tell us what’s happening:

formatText(testText, ‘right’) should produce text with columns justified to the right.
Failed:formatText(testText, ‘left’) should produce text with columns justified to the left.
Failed:formatText(testText, ‘center’) should produce text with columns justified to the center.

Your code so far

function formatText(textArray, alignment = 'left') {
    if (!Array.isArray(textArray) || textArray.length === 0) {
        throw new Error('Input should be a non-empty array of strings.');
    }

    const validAlignments = ['left', 'right', 'center'];
    if (!validAlignments.includes(alignment)) {
        throw new Error(`Invalid alignment. Choose from: ${validAlignments.join(', ')}`);
    }

    // Split each line into fields
    const splitLines = textArray.map(line => line.split('$'));

    // Determine the maximum width of each column
    const colWidths = splitLines[0].map((_, colIndex) => 
        Math.max(...splitLines.map(line => (line[colIndex] || '').length))
    );

    // Function to justify text within a given width
    const justify = (text, width, alignment) => {
        const spaces = width - text.length;
        switch (alignment) {
            case 'right':
                return ' '.repeat(spaces) + text;
            case 'center':
                const leftSpaces = Math.floor(spaces / 2);
                const rightSpaces = spaces - leftSpaces;
                return ' '.repeat(leftSpaces) + text + ' '.repeat(rightSpaces);
            case 'left':
            default:
                return text + ' '.repeat(spaces);
        }
    };

    // Build the aligned text
    const alignedText = splitLines.map(line => 
        line.map((field, colIndex) => justify(field || '', colWidths[colIndex], alignment)).join(' ')
    );

    return alignedText.join('\n');
}

// Example usage:
const testText = [
    'Given$a$text$file$of$many$lines',
    'where$fields$within$a$line$',
    'are$delineated$by$a$single$"dollar"$character',
    'write$a$program',
    'that$aligns$each$column$of$fields',
    'by$ensuring$that$words$in$each$',
    'column$are$separated$by$at$least$one$space.',
    'Further,$allow$for$each$word$in$a$column$to$be$either$left$',
    'justified,$right$justified',
    'or$center$justified$within$its$column.'
];

console.log(formatText(testText, 'left')),
console.log(formatText(testText, 'right')),
console.log(formatText(testText, 'center'));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36 Edg/127.0.0.0

Challenge Information:

Rosetta Code Challenges - Align columns

2

Please Tell us what’s happening in your own words.

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