What is the most effective method for iterating through a JavaScript array?

Let's discuss an interesting way to work with JavaScript arrays. Consider the array below:

const allRows = [
        {id: 1, name: Name 1},
        {id: 2, name: Name 1},
        {id: 3, name: Name 1},
        {id: 4, name: Name 1},
        {id: 5, name: Name 1},
        {id: 6, name: Name 1},
        {id: 7, name: Name 1},
        {id: 8, name: Name 1},
        {id: 9, name: Name 1},
        {id: 10, name: Name 1},
        {id: 11, name: Name 1},
        {id: 12, name: Name 1},
        {id: 13, name: Name 1},
        {id: 14, name: Name 1},
        {id: 15, name: Name 1},
        {id: 16, name: Name 1},
        {id: 17, name: Name 1},
        {id: 18, name: Name 1},
        {id: 19, name: Name 1},
        {id: 20, name: Name 1},
        {id: 21, name: Name 1},
        {id: 22, name: Name 1},
        {id: 23, name: Name 1},
        {id: 24, name: Name 1},
        {id: 25, name: Name 1},
        {id: 26, name: Name 1},
        {id: 27, name: Name 1},
        {id: 28, name: Name 1},
        {id: 29, name: Name 1},
        {id: 30, name: Name 1},
    ];

// We want to rearrange the above array into the following paginated structure:

let rowsPaginated = [
    [
        {id: 1, name: Name 1},
        {id: 2, name: Name 1},
        {id: 3, name: Name 1},
        {id: 4, name: Name 1},
        {id: 5, name: Name 1},
        {id: 6, name: Name 1},
        {id: 7, name: Name 1},
        {id: 8, name: Name 1},
        {id: 9, name: Name 1},
        {id: 10, name: Name 1}
    ],
    [
        {id: 11, name: Name 1},
        {id: 12, name: Name 1},
        {id: 13, name: Name 1},
        {id: 14, name: Name 1},
        {id: 15, name: Name 1},
        {id: 16, name: Name 1},
        {id: 17, name: Name 1},
        {id: 18, name: Name 1},
        {id: 19, name: Name 1},
        {id: 20, name: Name 1}
    ],
    [
        {id: 21, name: Name 1},
        {id: 22, name: Name 1},
        {id: 23, name: Name 1},
        {id: 24, name: Name 1},
        {id: 25, name: Name 1},
        {id: 26, name: Name 1},
        {id: 27, name: Name 1},
        {id: 28, name: Name 1},
        {id: 29, name: Name 1},
        {id: 30, name: Name 1}
    ]
];

I am considering a simple loop to convert the array, but I am open to other suggestions. Feel free to share your thoughts on the best approach to achieve this pagination.

javascriptarrays

Answer №1

To easily divide an array into smaller chunks, you can use the slice() method. Give it the size you want to cut from the array. Here's an example:

const allRows = [
        {id: 1, name: 'Name 1'},
        {id: 2, name: 'Name 1'},
        {id: 3, name: 'Name 1'},
        // Additional array elements...
        {id: 29, name: 'Name 1'},
        {id: 30, name: 'Name 1'},
    ];

let rowsPaginated = [];
var i, j, size = 10; 
for (i = 0, j = allRows.length; i < j; i += size) {
    rowsPaginated.push(allRows.slice(i, i+size));
}
console.log(rowsPaginated);

Answer №2

Here is a revised version of the code with corrections made to the array:

const allData = [
    {id: 1, name: "John"},
    {id: 2, name: "Jane"},
    {id: 3, name: "Bob"},
    {id: 4, name: "Alice"},
    {id: 5, name: "Sara"},
    {id: 6, name: "Mike"},
    {id: 7, name: "Emily"},
    {id: 8, name: "Chris"},
    {id: 9, name: "Linda"},
    {id: 10, name: "Tom"},
    {id: 11, name: "Anna"},
    {id: 12, name: "Paul"},
    {id: 13, name: "Grace"},
    {id: 14, name: "Daniel"},
    {id: 15, name: "Sophia"},
    {id: 16, name: "Oliver"},
    {id: 17, name: "Mia"},
    {id: 18, name: "Henry"},
    {id: 19, name: "Eva"},
    {id: 20, name: "Luke"},
    {id: 21, name: "Aria"},
    {id: 22, name: "David"},
    {id: 23, name: "Julia"},
    {id: 24, name: "Ryan"},
    {id: 25, name: "Lucy"},
    {id: 26, name: "Oscar"},
    {id: 27, name: "Hannah"},
    {id: 28, name: "Peter"},
    {id: 29, name: "Sophie"},
    {id: 30, name: "Ben"}
];

let paginatedData = [];
let k = 0;
for (let l = 0, k = allData.length; l < k; l += 10) {
    paginatedData.push(allData.slice(l, l+10));
}

console.log(paginatedData);

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