array4.js

//PREP (parameters, returns, examples, pseudocode)
//Training JS #4: Basic data types--Array

// I've written five function, each function receives a parameter: arr(an array), you should code something with arr.

//     1. getLength(arr)    should return length of arr
//     2. getFirst(arr)     should return the first element of arr
//     3. getLast(arr)      should return the last element of arr
//     4. pushElement(arr)  should push an element to arr, and then return arr
//     5. popElement(arr)   should pop an element from arr, and then return arr
// When you have finished the work, click "Run Tests" to see if your code is working properly.

// In the end, click "Submit" to submit your code pass this kata.

//Given 5 different functions, I need to return what it says in each function. 
//Will I ever get a string, or an empty array? or some other edge case that I need to be aware of? 
//for first one, I need to return the length. Can you give me an example output? 
// For 2nd one, first element. Can you give me an example output? 
//3rd - get the last element, can you give me an example output? 
//4th - push the variable to into the array. 
// pop an element- remove it from the end of the array. 

function getLength(arr){
    //return length of arr
    return arr.length
  }
  function getFirst(arr){
    //return the first element of arr
    return arr[0]
  }
  function getLast(arr){
    //return the last element of arr
    return arr[arr.length-1]
  }
  function pushElement(arr){
    var el=1;
    //push el to arr
     arr.push(el)
    
    return arr
  }
  function popElement(arr){
    //pop an element from arr
     arr.pop()
     return arr
  }

  //returns
  console.log(getLength([1,2,3]))//3);
  console.log(getFirst([1,2,3]))//1);
  console.log(getLast([1,2,3]))//3);
 console.log(pushElement([1,2,3]))//length,4);
  console.log(popElement([1,2,3]))//length,2);