JS Array Methods

Question 1

arr.concat()

Answer 1

combines arrays since JS cannot do this using +

returns a new array containing all the elements from the old arrays

can take multiple arguments to combine multiple arrays

example:
[1, 2].concat([3, 4], [5, 6])
[1, 2, 3, 4, 5, 6]

Question 2

arr.includes()

Answer 2

can check for whether an array includes an element

returns boolean

example:
[‘a’, ‘b’].includes(‘c’)
false

Question 3

arr.fill()

Answer 3

fills an array with a given value

existing values will be overwritten by the given value