Initial data commit

Task/Multiplication-tables/JavaScript/multiplication-tables-5.js

@@ -0,0 +1,74 @@
+(() => {
+    "use strict";
+
+    // -------------- MULTIPLICATION TABLE ---------------
+
+    // multTable :: Int -> Int -> [[String]]
+    const multTable = m => n => {
+        const xs = enumFromTo(m)(n);
+
+        return [
+            ["x", ...xs],
+            ...xs.flatMap(
+                x => [
+                    [x, ...xs.flatMap(
+                        y => y < x ? (
+                            [""]
+                        ) : [`${x * y}`]
+                    )]
+                ]
+            )
+        ];
+    };
+
+    // ---------------------- TEST -----------------------
+
+    // main :: () -> IO String
+    const main = () =>
+        wikiTable({
+            class: "wikitable",
+            style: [
+                "text-align:center",
+                "width:33em",
+                "height:33em",
+                "table-layout:fixed"
+            ].join(";")
+        })(
+            multTable(1)(12)
+        );
+
+    // ---------------- GENERIC FUNCTIONS ----------------
+
+    // enumFromTo :: Int -> Int -> [Int]
+    const enumFromTo = m => n =>
+        n >= m ? Array.from({
+            length: Math.floor(n - m) + 1
+        }, (_, i) => m + i) : [];
+
+
+    // ------------------- FORMATTING --------------------
+
+    // wikiTable :: Dict -> [[a]] -> String
+    const wikiTable = opts =>
+        rows => {
+            const
+                style = ["class", "style"].reduce(
+                    (a, k) => k in opts ? (
+                        `${a}${k}="${opts[k]}" `
+                    ) : a, ""
+                ),
+                body = rows.map((row, i) => {
+                    const
+                        cells = row.map(
+                            x => `${x}` || " "
+                        ).join(" || ");
+
+                    return `${i ? "|" : "!"} ${cells}`;
+                }).join("\n|-\n");
+
+            return `{| ${style}\n${body}\n|}`;
+        };
+
+    //  MAIN ---
+    return main();
+})();