Скачать или смотреть How to Generate a Multiplication Table as a Two-Dimensional Array in JavaScript

Create a function in JavaScript that generates a multiplication table with headers. Learn how to structure the table and implement it step-by-step!
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Creating a Multiplication Table with Headers

Generating a multiplication table can be a fun and educational task, especially for beginners learning to code. If you've ever wanted to create a function that produces a multiplication table with both header rows and header columns in JavaScript, you've arrived at the right place. This guide will walk you through the process step-by-step.

The Problem

You want to build a function that accepts three arguments:

col: The starting value for columns.

row: The starting value for rows.

size: The size of the table (how many rows and columns it should contain).

Example

When you call the function table(1, 3, 4), you expect it to produce the following two-dimensional array:

[[See Video to Reveal this Text or Code Snippet]]

Key Points:

The header row starts at 1.

The first column starts at 3.

The size of the table is determined by the third argument, resulting in a total of 5 rows and 5 columns.

The Solution

Now, let's dive into the solution. We'll break down each part of the code to clarify how it works.

Step 1: Initialize the Table

First, create a new array that will store our table:

[[See Video to Reveal this Text or Code Snippet]]

This initializes a two-dimensional array with (size + 1) to account for headers.

Step 2: Set the Top-Left Cell

The top-left cell of the table should always be null:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Populate the Header Row

Now, populate the first row with numbers starting from the col value:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Populate the Header Column

Next, fill in the first column with numbers starting from the row value:

[[See Video to Reveal this Text or Code Snippet]]

Step 5: Calculate the Multiplication Values

Finally, you'll loop through the table to fill in all the multiplication values based on the first row and first column:

[[See Video to Reveal this Text or Code Snippet]]

Full Function Code

Here is the completed function that you can use:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

With this guide, you now have a clear understanding of how to generate a multiplication table with headers as a two-dimensional array in JavaScript. You can expand upon this function by adding more features or formatting the output to suit your needs. Happy coding!