// Methods are a way to change data that you have created

// Each data type has methods built inside of it

// Methods are only used when you add () after their name

// String Methods

let aString = "My string"

aString.toUpperCase()

aString.toLowerCase()

aString.startsWith("M")

// Number methods

let myNumber = 1

myNumber.toPrecision()

// Array Methods

let myArray = []

// Push adds an item to an array

myArray.push('something')

// Pop removes the last item in the array

myArray.pop()

// length gives you the number of elements in the array

myArray.length

// Iterators go through every item

// and do something

// forEach just does something for each

// item in the array. In this case it will print

// each item

let myArray2 = [1, 2, 3, 4]

myArray2.forEach(

(item) => {

console.log(item)

}

)

// Map creates a new array in the background,

// and adds each thing that is returned to the

// new array. In this case, the numbers in

// myArray2 will have 1 added to them and put into

// the newArray. But, myArray2 will remain the same

let newArray = myArray2.map(

(item) => {

return item++

}

)

// Here, filter will also create a new

// array, which will not include any odd

// numbers. The old array will stay the same,

// but the new array will have only the items

// that return true

let myFilteredArray = myArray2.filter(

(item) => {

return item % 2 === 0

}

)