Question

How to format an array of strings in lines with maxWidth without breaking the words in TypeScript

Answer 1

function formatLines(words: string[], maxWidth: number): string[] {
    const result: string[] = [];
    let currentLine: string = "";
    let currentLength: number = 0;

    for (const word of words) {
        const wordLen = word.length;

        // If adding this word exceeds maxWidth, push current line
        if (currentLength + (currentLine === "" ? 0 : 1) + wordLen > maxWidth) {
            if (currentLine !== "") {
                result.push(currentLine);
            }
            currentLine = word;
            currentLength = wordLen;
        } else {
            if (currentLine !== "") {
                currentLine += " ";
                currentLength++;
            }
            currentLine += word;
            currentLength += wordLen;
        }
    }

    // Push the last line if not empty
    if (currentLine !== "") {
        result.push(currentLine);
    }

    return result;
}

// Main
function main(): void {
    const words: string[] = ["This", "is", "a", "programming", "example", "of", "text", "wrapping"];
    const maxWidth = 12;

    const lines: string[] = formatLines(words, maxWidth);

    for (const line of lines) {
        console.log(`"${line}"`);
    }
}

main();
  


/*
run:

"This is a"
"programming"
"example of"
"text"
"wrapping"

*/

 

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