使用2个循环创建二维数组

function create2DArray(rows, cols) {
    let arr = new Array(rows);
    for (let i = 0; i < rows; i++) {
        arr[i] = new Array(cols);
    }
    return arr;
}

// 示例：创建一个3行4列的二维数组
let my2DArray = create2DArray(3, 4);
console.log(my2DArray);

function create2DArray(rows, cols, initialValue = 0) {
    let arr = new Array(rows);
    for (let i = 0; i < rows; i++) {
        arr[i] = new Array(cols).fill(initialValue);
    }
    return arr;
}

let my2DArray = create2DArray(3, 4, 0);
console.log(my2DArray);

// 使用稀疏矩阵库（如lodash）来创建稀疏二维数组
const _ = require('lodash');

let sparseArray = _.zipObject([], []);
sparseArray[0] = _.zipObject([], []);
sparseArray[0][0] = 1;
console.log(sparseArray);