JS methods

Question 1

Why do we log things to the console?

Answer 1

to double check work

Question 2

What is a method?

Answer 2

method is a function within an object

property holding a function

Question 3

How is a method different from any other function?

Answer 3

functions are called by name, methods are called by objects

Question 4

How do you remove the last element from an array?

Answer 4

.pop( ) EXAMPLE
var numbers = ['1', '2', '3']
console.log(numbers.pop( ) );
return '3'
console.log(numbers);
return ['1', '2']

Question 5

How do you round a number down to the nearest integer?

Answer 5

Math.floor( ) EXAMPLE
Math.floor(5.95)
return 5
Math.floor(5.05)
return 5

Question 6

How do you generate a random number?

Answer 6

Math.random( );

Question 7

How do you delete an element from an array?

Answer 7

.splice( ) EXAMPLE
var months = [‘jan’, ‘march’]
months.splice(1, 0, ‘feb’)
return [‘jan’, ‘feb’, ‘march’]

var months = ['jan', 'feb', 'April']
months.splice(2, 1, 'march')
return ['jan', 'feb', 'march']

Question 8

How do you append an element to an array?

Answer 8

objectName.push(element)

Question 9

How do you break a string up into an array?

Answer 9

objectName.split( )

Question 10

Do string methods change the original string? How would you check if you weren’t sure?

Answer 10

no, console.log(‘string’) or MDN

Question 11

Roughly how many string methods are there according to the MDN Web docs?

Answer 11

MANY

Question 12

Is the return value of a function or method useful in every situation?

Answer 12

no

Question 13

Roughly how many array methods are there according to the MDN Web docs?

Answer 13

MANY

Question 14

What three-letter acronym should you always include in your Google search about a JavaScript method or CSS property?

Answer 14

MDN