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Advanced JavaScript: Array Methods and Higher-Order Functions

Array Methods

Higher-Order Functions

  • A higher-order function is a function that either takes one or more functions as arguments or returns a function as its result.
  • This concept is derived from functional programming and is widely used in modern programming languages like TypeScript and JavaScript.
  • Higher-order functions provide a way to create more abstract, modular, and reusable code.

Using Higher-Order Functions to Write More Modular and Reusable Code:

  • Abstraction: Higher-order functions allow you to encapsulate behavior that can be reused across different contexts. This helps in abstracting complex logic and making code more understandable.
  • Modularity: By breaking down behavior into smaller functions, you can create more modular code that can be combined to create more complex behaviors.
  • Reusability: Higher-order functions enable you to create reusable components that can be used in different parts of your codebase, promoting DRY (Don't Repeat Yourself) principles.
  • Composability: Higher-order functions can be composed together to create new functionalities. This encourages a functional style of programming and allows you to build complex behaviors from simpler parts.
// Higher-order function example
function operationOnNumbers(a, b, operation) {
  return operation(a, b);
}

const add = (x, y) => x + y;
const subtract = (x, y) => x - y;

const result1 = operationOnNumbers(5, 3, add);       // Result: 8
const result2 = operationOnNumbers(10, 4, subtract); // Result: 6

Exercises

Assignments

Enhancing the Restaurant App with Filter and Display Feature

In this assignment, you will enhance your restaurant app by implementing a feature that allows users to filter and display only Sodexho or Compass restaurants. This assignment will emphasize the use of map and filter methods with arrays, promoting a modern and functional approach to solving the problem.

Requirements:

  1. Refactor your previous restaurant assignment code to make effective use of array methods like forEach, map and filter.

  2. Implement the feature to filter and display only Sodexho or Compass restaurants using the filter method. Use arrow functions to streamline the filtering process.

  3. Implement robust error handling for user interactions, such as displaying informative messages in case of failures.