Javascript Practice 53: JS Hero - Array: length

 

Question: 

Write a function getLastElement that takes an array and returns the last element of the array.

Example: getLastElement([1, 2]) should return 2.

Answer: 

function getLastElement (anArray) {

  let lastIndex = anArray.length - 1;

  return anArray[lastIndex];

}

> we learn how to access the last element of an array 

> we use the length property 

> this property will return the number of elements in the array 

> subtracting 1 from the length of an array gives the index of the last element of that array

> this index can be used to access the last element of that array 

> we declare a function getLastElement

> it has 1 parameter anArray

> we declare a variable lastIndex

> we initialize it with a value, which will be the index of the last element of the array

> we then return the last element like this: anArray [lastIndex]