Last active
November 16, 2017 18:42
-
-
Save hraban/d2ad734f0365f9aac0adb7c616286ac0 to your computer and use it in GitHub Desktop.
carthesian product in TypeScript
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function carthesian<T>(columns: T[][], f: (x: T[]) => void, stackOut: T[] = []): void { | |
if (columns.length === 0) { | |
f(stackOut) | |
} else { | |
const column = columns.shift()!; | |
column.forEach(entry => { | |
stackOut.push(entry); | |
carthesian(columns, f, stackOut); | |
stackOut.pop(); | |
}); | |
columns.unshift(column); | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
const columns = [ | |
[1, 2, 3], | |
[4, 5, 6], | |
[7, 8, 9], | |
]; | |
carthesian(columns, x => console.log(x)); | |
// => | |
// | |
// [ 1, 4, 7 ] | |
// [ 1, 4, 8 ] | |
// [ 1, 4, 9 ] | |
// [ 1, 5, 7 ] | |
// [ 1, 5, 8 ] | |
// [ 1, 5, 9 ] | |
// [ 1, 6, 7 ] | |
// [ 1, 6, 8 ] | |
// [ 1, 6, 9 ] | |
// [ 2, 4, 7 ] | |
// [ 2, 4, 8 ] | |
// [ 2, 4, 9 ] | |
// [ 2, 5, 7 ] | |
// [ 2, 5, 8 ] | |
// [ 2, 5, 9 ] | |
// [ 2, 6, 7 ] | |
// [ 2, 6, 8 ] | |
// [ 2, 6, 9 ] | |
// [ 3, 4, 7 ] | |
// [ 3, 4, 8 ] | |
// [ 3, 4, 9 ] | |
// [ 3, 5, 7 ] | |
// [ 3, 5, 8 ] | |
// [ 3, 5, 9 ] | |
// [ 3, 6, 7 ] | |
// [ 3, 6, 8 ] | |
// [ 3, 6, 9 ] |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment