US Patent 9836288 Eager and optimistic evaluation of promises

The invention relates to a method for generating executable code from application source code. The method steps include determining a programmatic expression using the application source code and determining a first value for the programmatic expression. The method steps further include compiling the programmatic expression into a first optimized code portion using the first value, an assumption, and an expression scope. The method steps further include executing the application source code. The method steps further include determining that the programmatic expression is modified outside of the expression scope, invalidating the assumption, and de-optimizing the first optimized code portion.