JavaScript Array Methods

What is the purpose of the push method in JavaScript arrays? Options: A) To add a new element to the end of an array. B) To add a new element to the beginning of an array. C) To remove the last element from an array.

Option A The push method is used to add a new element to the end of an array.

Which of the following methods would you use to calculate a single value based on the elements in an array? Options: A) reduce() B) forEach() C) map()

Option A The reduce method is used to calculate a single value based on the elements in an array.

Which of the following methods would you use to return a new array with the same elements as the original array, but in reverse order? Options: A) reverse() B) sort() C) concat()

Option A The reverse method is used to return a new array with the same elements as the original array, but in reverse order.

Which of the following methods would you use to remove the first element from an array and return it? Options: A) shift() B) unshift() C) pop()

Option A The shift method is used to remove the first element from an array and return it.

Which of the following methods would you use to add a new element to an array? Options: A) reduce() B) map() C) push()

Option C The push method is used to add a new element to the end of an array.

Which of the following methods would you use to check if all elements in an array pass a provided condition? Options: A) every() B) some() C) filter()

Option A The every method is used to check if all elements in an array pass a provided condition.

Which of the following methods would you use to return a new array with a portion of an existing array without modifying the original array? Options: A) slice() B) splice() C) reduce()

Option A The slice method is used to return a new array with a portion of an existing array without modifying the original array.

Which of the following methods would you use to return a new array with the first n elements of an existing array? Options: A) slice() B) splice() C) reduce()

Option A The slice method is used to return a new array with the first n elements of an existing array.

Which of the following methods would you use to sort the elements in an array based on a provided condition? Options: A) sort() B) filter() C) map()

Option A The sort method is used to sort the elements in an array based on a provided condition.

Which of the following methods would you use to remove elements from an array based on a provided condition? Options: A) reduce() B) filter() C) map()

Option B The filter method is used to remove elements from an array based on a provided condition.

Which of the following methods would you use to check if an array includes a specified element? Options: A) find() B) includes() C) indexOf()

Option B The includes method is used to check if an array includes a specified element.

What is the purpose of the join method in JavaScript arrays? Options: A) To add a new element to an array. B) To convert an array to a string. C) To remove elements from an array based on a provided condition.

Option B The join method is used to convert an array to a string.

What is the purpose of the map method in JavaScript arrays? Options: A) To filter out elements in an array. B) To transform each element in an array. C) To add a new element to an array.

Option B The map method is used to transform each element in an array based on a provided function and return a new array with the transformed elements.

What is the purpose of the reduce method in JavaScript arrays? Options: A) To join all elements in an array into a string. B) To calculate a single value based on the elements in an array. C) To remove the first element in an array.

Option B The reduce method is used to calculate a single value based on the elements in an array.

Which of the following methods would you use to check if any elements in an array pass a provided condition? Options: A) every() B) some() C) filter()

Option B The some method is used to check if any elements in an array pass a provided condition.

Which of the following methods would you use to add a new element to the beginning of an array and return the new length of the array? Options: A) shift() B) unshift() C) pop()

Option B The unshift method is used to add a new element to the beginning of an array and return the new length of the array.

What is the purpose of the unshift method in JavaScript arrays? Options: A) To add a new element to the end of an array. B) To add a new element to the beginning of an array. C) To remove the first element from an array.

Option B The unshift method is used to add a new element to the beginning of an array.

Which of the following methods would you use to add a new element to the beginning of an array? Options: A) shift() B) unshift() C) pop()

Option B The unshift method is used to add a new element to the beginning of an array.

Which of the following methods would you use to convert an array-like object to an array? Options: A) slice() B) concat() C) Array.from()

Option C The Array.from method is used to convert an array-like object to an array.

What is the purpose of the filter method in JavaScript arrays? Options: A) To sort the elements in an array. B) To transform each element in an array. C) To remove elements from an array based on a provided condition.

Option C The filter method is used to remove elements from an array based on a provided condition.

What is the purpose of the forEach method in JavaScript arrays? Options: A) To add a new element to an array. B) To sort the elements in an array. C) To iterate over each element in an array.

Option C The forEach method is used to iterate over each element in an array and perform a function on each element.

Which of the following methods would you use to iterate over each element in an array and perform a function on each element? Options: A) filter() B) map() C) forEach()

Option C The forEach method is used to iterate over each element in an array and perform a function on each element.

Which of the following methods would you use to find the index of a specified element in an array? Options: A) findIndex() B) includes() C) indexOf()

Option C The indexOf method is used to find the index of a specified element in an array.

Which of the following methods would you use to transform each element in an array based on a provided condition and return a new array with the transformed elements? Options: A) filter() B) reduce() C) map()

Option C The map method is used to transform each element in an array based on a provided function and return a new array with the transformed elements.

Which of the following methods would you use to transform each element in an array based on a provided function and return a new array with the transformed elements? Options: A) filter() B) reduce() C) map()

Option C The map method is used to transform each element in an array based on a provided function and return a new array with the transformed elements.

Which of the following methods would you use to remove the last element from an array and return it? Options: A) shift() B) unshift() C) pop()

Option C The pop method is used to remove the last element from an array and return it.

What is the purpose of the pop method in JavaScript arrays? Options: A) To add a new element to an array. B) To remove the first element from an array. C) To remove the last element from an array.

Option C The pop method is used to remove the last element from an array.

Which of the following methods would you use to remove the last element from an array? Options: A) shift() B) unshift() C) pop()

Option C The pop method is used to remove the last element from an array.

Which of the following methods would you use to add one or more elements to an array and remove elements from an array, and return the removed elements as a new array? Options: A) filter() B) map() C) splice()

Option C The splice method is used to add one or more elements to an array and remove elements from an array, and return the removed elements as a new array.

Which of the following methods would you use to remove elements from an array and return the removed elements as a new array? Options: A) filter() B) map() C) splice()

Option C The splice method is used to remove elements from an array and return the removed elements as a new array.