//////////////////
//1. Iterate over arrays with map
//////////////////
//Use the map function to add 3 to every value in the variable oldArray, and save the results into variable newArray. oldArray should not change.

var oldArray = [1,2,3,4,5];

// Only change code below this line.

var newArray = oldArray.map(function(x){
    return x + 3;
});

//////////////////
//2. Condense arrays with reduce
//////////////////
//Use the reduce method to sum all the values in array and assign it to singleVal.

var array = [4,5,6,7,8];
var singleVal = 0;

// Only change code below this line.

singleVal = array.reduce(function(acc,val){
    return acc + val;
},0);


//////////////////
// 3. Filter arrays with filter
//////////////////
// Use filter to create a new array with all the values from oldArray which are less than 6. The oldArray should not change.


var oldArray = [1,2,3,4,5,6,7,8,9,10];

// Only change code below this line.

function lessThanSix(value) {
  return value < 6;
}

var newArray = oldArray.filter(lessThanSix);
console.log(newArray);