Optimize custom Object Property in Array with Javascript

Look at the 3 lines of code within this Javascript function. Assume that `y` will always be a *String*: function example(x, y) { var s = {}; s[y] = x; return s; } Bearing in mind the following: 1. Without wrapping it further within a function 2. Without using `;` Is it possible to condense the 3 lines of code into one?
Learning "code tricks" like this is a waste of time. If this is an interview question then for shame.

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