Schema
March 26th, 2022 — 3 min read
I’m working on the IQ test again. I’ll have to work on the best way to represent rules, and configuration for different graphics. Basically, I think I will have a 3x3 array, filled with blank config files - maybe they will have indexes and neighbor references. Then I will apply rules to this array, modifying the config files. The config files will be able to define a graphic, like a grid with shapes, nested shapes, dot patterns etc.
The answer choices will have random parameters tweaked in this process, like modified rule numeric values or starting index.
The other day, I made a function to return an arbitrary diagonal of a matrix.
utils.js
javascript
/**
* The range of % is (-n, n). positiveMode restricts the range to [0, n).
*
* @param {a value} x
* @param {the modulus} n
* @returns x mod n | x ϵ [0,n)
*/
const positiveMod = (x, n) => ((x % n) + n) % n;
/**
* Pick a diagonal from a grid.
*
* @param {3x3 grid} grid
* @param {column index of first element} diagonalIndex
* @param {1: right, -1: left} direction
* @returns {array of elements in the diagonal, starting at the given index moving down and in the given direction}
*/
/**
* 1 2 3 -1 -2 -3
* 3 1 2 -2 -3 -1
* 2 3 1 -3 -1 -2
*/
export const getDiagonal = (grid, diagonalIndex, direction) => {
if (diagonalIndex < 0) {
diagonalIndex = positiveMod(diagonalIndex, grid[0].length);
}
const output = [];
for (let i = 0; i < grid.length; i++) {
output.push(grid[i][positiveMod(diagonalIndex + direction * i, grid[i].length)]);
}
return output;
};
