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+### indexesOf
+
+Returns an array of indexes at which the `val` occurs in `arr`. If it occurs only once return the `index` and if it never occurs returns `-1`
+
+``` js
+const indexesOf = (arr, val) => {
+    let indexes = [], i;
+    for(i = 0; i < arr.length; i++)
+        if (arr[i] === val)
+            indexes.push(i);
+    return indexes.length === 0 ? -1 : indexes.length === 1 indexes.pop() : indexes
+}
+```