Migrate doctest for ConwaysGameOfLife.js

(remove the animate code, too)

Cellular-Automata/ConwaysGameOfLife.js

@@ -8,17 +8,10 @@ The Game of Life is a cellular automaton devised by the British mathematician Jo
 (example adapted from https://github.com/TheAlgorithms/Python/blob/master/cellular_automata/conways_game_of_life.py )
 */
 
-/*
-* Doctests
-*
-* > newGeneration([[0, 1, 0], [0, 1, 0], [0, 1, 0]])
-* [ [ 0, 0, 0 ], [ 1, 1, 1 ], [ 0, 0, 0 ] ]
-*/
-
-/*
-* Generates the next generation for a given state of Conway's Game of Life.
-*/
-function newGeneration (cells) {
+/**
+ * Generates the next generation for a given state of Conway's Game of Life.
+ */
+export function newGeneration (cells) {
  const nextGeneration = []
  for (let i = 0; i < cells.length; i++) {
  const nextGenerationRow = []
@@ -46,45 +39,3 @@ function newGeneration (cells) {
  }
  return nextGeneration
 }
-
-/*
-* utility function to display a series of generations in the console
-*/
-async function animate (cells, steps) {
- /*
- * utility function to print one frame
- */
- function printCells (cells) {
- console.clear()
- for (let i = 0; i < cells.length; i++) {
- let line = ''
- for (let j = 0; j < cells[i].length; j++) {
- if (cells[i][j] === 1) line += '\u2022'
- else line += ' '
- }
- console.log(line)
- }
- }
-
- printCells(cells)
-
- for (let i = 0; i < steps; i++) {
- await new Promise(resolve => setTimeout(resolve, 250)) // sleep
- cells = newGeneration(cells)
- printCells(cells)
- }
-}
-
-// Define glider example
-const glider = [
- [0, 1, 0, 0, 0, 0, 0, 0],
- [0, 0, 1, 0, 0, 0, 0, 0],
- [1, 1, 1, 0, 0, 0, 0, 0],
- [0, 0, 0, 0, 0, 0, 0, 0],
- [0, 0, 0, 0, 0, 0, 0, 0],
- [0, 0, 0, 0, 0, 0, 0, 0],
- [0, 0, 0, 0, 0, 0, 0, 0],
- [0, 0, 0, 0, 0, 0, 0, 0]
-]
-
-animate(glider, 16)

Cellular-Automata/ConwaysGameOfLife.test.js

@@ -0,0 +1,8 @@
+import { newGeneration } from './ConwaysGameOfLife'
+
+describe('newGeneration', () => {
+ it('should produce the next generation according to the rules', () => {
+ expect(newGeneration([[0, 1, 0], [0, 1, 0], [0, 1, 0]]))
+ .toEqual([[0, 0, 0], [1, 1, 1], [0, 0, 0]])
+ })
+})