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JavaScript Arrays Properties and Methods

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JavaScript Arrays Properties and Methods

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Questions and Answers

What is the index of the first element in an array?

0 (correct)

-1

None of the above

What is the purpose of the Array object when declaring an array?

To create an array with a specific data type

To initialize an empty array

To create a multidimensional array

To specify the length of the array (correct)

What is the difference between var a_ary = ['a', 'b', 'c']; and var a_ary = new Array('a', 'b', 'c');?

The first one creates an array, the second one creates a string

The first one creates a string, the second one creates an array

There is no difference, both create an array (correct)

The first one creates a sparse array, the second one creates a dense array

What is the output of console.log(a_ary.length);?

8 Signup and view all the answers

What is the purpose of the length property of an array?

To get the number of elements in the array Signup and view all the answers

What happens when you use Array.prototype.unshift() on an array?

It adds elements to the beginning of the array Signup and view all the answers

What is the difference between Array.prototype.shift() and Array.prototype.pop()?

shift() removes the first element, pop() removes the last element Signup and view all the answers

What is the purpose of the Array.prototype.splice() method?

To add or remove elements from an array at a specified position Signup and view all the answers

What is the return value of the Array.prototype.shift() method?

The removed element Signup and view all the answers

What happens when you use Array.prototype.push() on an array?

It adds elements to the end of the array Signup and view all the answers