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Exercise 13

Consider the following code:

function foo(bar) {
  console.log(bar());
}

foo();    // Should print 'Welcome'
foo();    // Should print 3.1415
foo();    // Should print [1, 2, 3]

As written, this code will raise an error on line 5. Without modifying the function definition of foo, update this code to print the desired text.

Solution

function foo(bar) {
  console.log(bar());
}

//highlight
foo(function() { return "Welcome" });
foo(function() { return 3.1415 });
foo(function() { return [1, 2, 3] });
//endhighlight

Since foo expects a function argument (as indicated by the call to bar on line 2), we know we need to pass each invocation a function that returns the desired value. Thus, we define and pass functions that return "Welcome", 3.1415, and [1, 2, 3] in the three invocations.

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# endhighlight
end
```

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# highlight
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# endhighlight
end