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1-js/4-data-structures/6-array/3-call-array-this/solution.md

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+The call `arr[2]()` is syntactically the good old `obj[method]()`, in the role of `obj` we have `arr`, and in the role of `method` we have `2`.
+
+So we have a call of the function `arr[2]` as an object method. Naturally, it receives `this` referencing the object `arr` and outputs the array:
+
+```js run
+let arr = ["a", "b"];
+
+arr.push(function() {
+  alert( this );
+})
+
+arr[2](); // "a","b",function
+```
+
+The array has 3 values: initially it had two, plus the function.