- Use closures to customize functions
- Use closures as a mechanism of encapsulations
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()
- Returns a function that then calculates whether a given trip is within range. For example,produceDrivingRange(10)
returns a function that will returnfalse
if the trip is over 10 blocks distance andtrue
if the distance is within range. SoproduceDrivingRange
returns a function that we can then use to calculate if a trip is too large for a driver. We recommend referencing thetest/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.
View Advanced Scope Closures Lab on Learn.co and start learning to code for free.