Mosaic matrix: Difference between revisions
→{{header|JavaScript}}: Added a version in JavaScript
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0 1 0 1 0
1 0 1 0 1</lang>
=={{header|JavaScript}}==
<lang javascript>(() => {
"use strict";
// ------------------ MOSAIC MATRIX ------------------
// mosaic :: Int -> [[Int]]
const mosaic = n => matrix(n)(n)(
row => col => (1 + row + col) % 2
);
// ---------------------- TEST -----------------------
// main :: IO ()
const main = () =>
// Matrices of dimensions 7 and 8.
[7, 8].map(
compose(
showMatrix(String),
mosaic
)
).join("\n\n");
// --------------------- GENERIC ---------------------
// compose (<<<) :: (b -> c) -> (a -> b) -> a -> c
const compose = (...fs) =>
// A function defined by the right-to-left
// composition of all the functions in fs.
fs.reduce(
(f, g) => x => f(g(x)),
x => x
);
// matrix Int -> Int -> (Int -> Int -> a) -> [[a]]
const matrix = nRows => nCols =>
// A matrix of a given number of columns and rows,
// in which each value is a given function of its
// (zero-based) column and row indices.
f => Array.from({
length: nRows
}, (_, iRow) => Array.from({
length: nCols
}, (__, iCol) => f(iRow)(iCol)));
// showMatrix :: (a -> String) -> [[a]] -> String
const showMatrix = fShow =>
rows => 0 < rows.length ? (() => {
const w = fShow(Math.max(...rows.flat())).length;
return rows.map(
cells => cells.map(
x => fShow(x).padStart(w, " ")
).join(" ")
).join("\n");
})() : "";
// main
return main();
})();</lang>
{{Out}}
<pre>1 0 1 0 1 0 1
0 1 0 1 0 1 0
1 0 1 0 1 0 1
0 1 0 1 0 1 0
1 0 1 0 1 0 1
0 1 0 1 0 1 0
1 0 1 0 1 0 1
1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1
1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1
1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1
1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1</pre>
=={{header|jq}}==
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