How to Create a Spiral of Numbers in JavaScript?

Estimated read time 2 min read

A spiral of numbers is a pattern where numbers are arranged in a circular fashion, spiraling out from the center. Here’s how you can create a spiral of numbers in JavaScript:

  1. Define a two-dimensional array to store the numbers.
var rows = 5;
var cols = 5;
var spiral = [];
for (var i = 0; i < rows; i++) {
  spiral[i] = [];
}
  1. Write a function that generates the spiral pattern.
var count = 1;
var maxCount = rows * cols;
var minRow = 0;
var maxRow = rows - 1;
var minCol = 0;
var maxCol = cols - 1;

function generateSpiral() {
  while (count <= maxCount) {
    // move right
    for (var i = minCol; i <= maxCol; i++) {
      spiral[minRow][i] = count++;
    }
    minRow++;

    // move down
    for (var i = minRow; i <= maxRow; i++) {
      spiral[i][maxCol] = count++;
    }
    maxCol--;

    // move left
    for (var i = maxCol; i >= minCol; i--) {
      spiral[maxRow][i] = count++;
    }
    maxRow--;

    // move up
    for (var i = maxRow; i >= minRow; i--) {
      spiral[i][minCol] = count++;
    }
    minCol++;
  }
}

In this code, the variables minRow, maxRow, minCol, and maxCol are used to keep track of the boundaries of the spiral, and are updated as the spiral is generated. The while loop continues until all numbers have been assigned to the spiral array.

  1. Call the generateSpiral function to generate the spiral pattern.
generateSpiral();

With these steps, you can create a spiral of numbers in JavaScript. You can then use this spiral array to display the numbers in a web page or for other purposes.

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