Implement Collection

src/collection/minByOrNull.ts

@@ -0,0 +1,14 @@
+export function minByOrNull<T>(value: T[], transform: (it: T) => number): T | null {
+    if (value.length === 0) return null;
+    let min = value[0];
+    let minVal = transform(min);
+    for (let index = 1; index < value.length; index++) {
+        const it = value[index];
+        const val = transform(it);
+        if (val < minVal) {
+            min = it;
+            minVal = val;
+        }
+    }
+    return min;
+}