三角形打印字符串

题目描述

给定一个字符串，将其打印成三角形：

题解

function output(str) {
    const strLength = str.length;
    let totalLine = 0;
    let containerSize = 0;
    while (containerSize < strLength) {
        containerSize += totalLine * 2 + 1;
        totalLine++;
    }
    let result = '';
    let startIndex = 0;
    for (let curLine = 1; curLine <= totalLine; curLine++) {
        const endIndex = startIndex + 2 * curLine - 1;
        output += '  '.repeat(totalLine - curLine) + str.slice(startIndex, endIndex) + '\n';
        startIndex = endIndex;
    }
    console.log(result);
}