# Closures Lab ## Objectives * Use closures to customize functions * Use closures as a mechanism of encapsulations ## Instructions In the lab that follows, practice using closures to construct functions that have reference to variables that the execution scope does not. Create the following functions: * `produceDrivingRange()` - Calculates whether a given trip is within range. For example, `produceDrivingRange(10)` returns a function that will take two strings as arguments and returns a message stating whether the trip is in range. If `foo = produceDrivingRange(10)`, then `foo('12th', '15th')` would return `"within range by 7"` and `foo('12th', '30th')` would return `"8 blocks out of range"`. We recommend referencing the `test/indexTest.js` for more details. * `produceTipCalculator()` - Returns a function that then calculates a tip. For example, `produceTipCalculator(.10)` returns a function that calculates ten percent tip on a fare. `produceTipCalculator(.20)` returns a function that calculates twenty percent tip on a fare. * `createDriver` is a function that returns a `Driver` class. The class has reference to a `driverId` that is incremented each time a new driver is created. The rest of the code base does not have access to `driverId`. The functions should make use of closures to achieve the specified goals. Clone :