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With the dramatic rise of functional programming in mainstream JavaScript, curried functions have become common in many applications. It’s important to understand what they are, how they work, and how to put them to good use. What is a curried function? A curried function is a function that takes multiple arguments one at a time. Given a function with 3 parameters, the curried version will take ..

Arrow function expressions An arrow function expression is a compact alternative to a traditional function expression, but is limited and can't be used in all situations. There are differences between arrow functions and traditional functions, as well as some limitations: Arrow functions don't have their own bindings to this or super, and should not be used as methods. Arrow functions don't have..

Mock Functions Mock functions allow you to test the links between code by erasing the actual implementation of a function, capturing calls to the function (and the parameters passed in those calls), capturing instances of constructor functions when instantiated with new, and allowing test-time configuration of return values. There are two ways to mock functions: Either by creating a mock functio..