JavaScript Callbacks and Arrays Quiz

A function that is applied to each element of an array, creating a new array with the transformed elements. It takes a callback function as an argument, which is executed for each element of the array.

A function that filters an array based on a condition. It takes a callback function as an argument, which returns true or false for each element. Only elements that meet the condition are included in the new array.

A function that iterates through an array, processing each element and accumulating a single value. It takes two parameters: the accumulator and the current element. The accumulator holds the result of the previous iteration.

The starting value of the accumulator in the reduce() method.

The value that is accumulated in the reduce() method, which represents the result of the previous iteration.

The current element of the array being processed during the reduce() method.

A callback function used in the reduce() method, which takes the accumulator and the current element as parameters. It performs some operation on these values, and returns the updated accumulator.

A function that returns the higher value between two numbers.

The pop() method removes the last element from an array and returns it. This modifies the original array.

A function passed as an argument to another function. It is executed after the main function completes its task.

A callback function's main purpose is to execute code in response to a specific event, enabling dynamic behavior.

The shift() method removes the first element from an array and returns it. The original array is modified.

The forEach() method executes a given function for each element in an array, but it doesn't change the original array. It's used for iterating through elements and performing actions on them.

JavaScript arrays can hold elements of different data types (numbers, strings, objects, etc.) within the same array.

The forEach() method accepts a function as an argument. This function takes three parameters: The element's value, its index, and the array itself. You can use these parameters to operate on each element.

JavaScript arrays automatically resize to accommodate new elements. You don't have to specify the size in advance.

An array literal provides a concise syntax to create an array using square brackets [] and separating elements with commas. For example, let colors = ['red', 'green', 'blue'];.

The map() method generates a new array by applying a given function to each element of the original array. The original array remains untouched.

The map() method takes a function that operates on each element of the array. The function should take the element value as an argument and return the transformed value. The map() uses this return value to populate the new array.

To access a specific element in an array, you use its index within square brackets []. The index starts from 0 for the first element. For example, arrayName[0], arrayName[1], etc.

The length property of an array returns the total number of elements within the array. For example, mountains.length would give you the number of mountains in the array.

An array is a data structure that holds multiple values in a sequential order. Each position in the array is called an element, and it can hold a variety of data types, such as strings, numbers, or booleans. Arrays allow you to store and manage collections of related information.

Arrays are used to store collections of related data. They enable us to efficiently access, modify, and manipulate multiple values in a structured manner. They are essential data structures in programming, allowing us to handle and process data in a more organized and efficient way.

The push() method adds a new element to the end of an existing array, increasing its length by 1.