Creating Javascript objects one

// Write a function that a string (a) as argument
// Create an object that has a property with key 'key' and a value of a
// Return the object
function
myFunction
(
a
)
{

return
}
Test Cases:
myFunction('a')
Expected
{key:'a'}
myFunction('z')
Expected
{key:'z'}
myFunction('b')
Expected
{key:'b'}