script.js

var finances = [
['Jan-2010', 867884],
['Feb-2010', 984655],
['Mar-2010', 322013],
['Apr-2010', -69417],
['May-2010', 310503],
['Jun-2010', 522857],
['Jul-2010', 1033096],
['Aug-2010', 604885],
['Sep-2010', -216386],
['Oct-2010', 477532],
['Nov-2010', 893810],
['Dec-2010', -80353],
['Jan-2011', 779806],
['Feb-2011', -335203],
['Mar-2011', 697845],
['Apr-2011', 793163],
['May-2011', 485070],
['Jun-2011', 584122],
['Jul-2011', 62729],
['Aug-2011', 668179],
['Sep-2011', 899906],
['Oct-2011', 834719],
['Nov-2011', 132003],
['Dec-2011', 309978],
['Jan-2012', -755566],
['Feb-2012', 1170593],
['Mar-2012', 252788],
['Apr-2012', 1151518],
['May-2012', 817256],
['Jun-2012', 570757],
['Jul-2012', 506702],
['Aug-2012', -1022534],
['Sep-2012', 475062],
['Oct-2012', 779976],
['Nov-2012', 144175],
['Dec-2012', 542494],
['Jan-2013', 359333],
['Feb-2013', 321469],
['Mar-2013', 67780],
['Apr-2013', 471435],
['May-2013', 565603],
['Jun-2013', 872480],
['Jul-2013', 789480],
['Aug-2013', 999942],
['Sep-2013', -1196225],
['Oct-2013', 268997],
['Nov-2013', -687986],
['Dec-2013', 1150461],
['Jan-2014', 682458],
['Feb-2014', 617856],
['Mar-2014', 824098],
['Apr-2014', 581943],
['May-2014', 132864],
['Jun-2014', 448062],
['Jul-2014', 689161],
['Aug-2014', 800701],
['Sep-2014', 1166643],
['Oct-2014', 947333],
['Nov-2014', 578668],
['Dec-2014', 988505],
['Jan-2015', 1139715],
['Feb-2015', 1029471],
['Mar-2015', 687533],
['Apr-2015', -524626],
['May-2015', 158620],
['Jun-2015', 87795],
['Jul-2015', 423389],
['Aug-2015', 840723],
['Sep-2015', 568529],
['Oct-2015', 332067],
['Nov-2015', 989499],
['Dec-2015', 778237],
['Jan-2016', 650000],
['Feb-2016', -1100387],
['Mar-2016', -174946],
['Apr-2016', 757143],
['May-2016', 445709],
['Jun-2016', 712961],
['Jul-2016', -1163797],
['Aug-2016', 569899],
['Sep-2016', 768450],
['Oct-2016', 102685],
['Nov-2016', 795914],
['Dec-2016', 60988],
['Jan-2017', 138230],
['Feb-2017', 671099]
];

//creates a new array that only contains the numerical values not the strings
NewArrayMoney = finances.map(a => a [1])   // what does the a => a do??
// console.log(NewArrayMoney)

// make an array  of only dates 
NewArrayDates = finances.map(a => a [0]);
// console.log(NewArrayDates);

console.log ("Financial Analysis");
console.log ("------------------------------"); 
//logs the total number of months
console.log("Total Months: " + finances.length); 

//calculates the total sum of all the months by adding their values incrimentally
var TotalSum = 0;

for (let i = 0; i < NewArrayMoney.length; i++) {
    TotalSum += NewArrayMoney[i];
}

console.log("Total Sum is: £" + TotalSum); 

// console.log(changesArray)
var changesArray = []

    for (let i = 0; i < (NewArrayMoney.length-1); i++) {
        var changes = NewArrayMoney[i+1] - NewArrayMoney [i+0]
            changesArray.push (changes);
                // console.log(changes);
  
        }

// calculates the average of all the profits and losses        
var AvChangeProfitLoss = 0; 

        for (let i = 0; i < changesArray.length; i++) {
                AvChangeProfitLoss += changesArray[i];           

        }

console.log("Average Change: £ " + (AvChangeProfitLoss / changesArray.length).toFixed(2)); 


//selects the biggest number in the array (e.g the biggest profit)
function BiggestNumberInArray(changesArray) {
    return Math.max.apply(Math, changesArray);
}

// console.log("Greatest Increase in Profits: " + BiggestNumberInArray(changesArray));

//Selects the smallest number in the array (e.g. the biggest loss)
function SmallestNumberInArray(changesArray) {
    return Math.min.apply(Math, changesArray);
}
// console.log("Greatest Decrease in Profits: " + SmallestNumberInArray(changesArray))

// converts the smallest number to an actual number (numerical value) 
var SmallestNumber = (+SmallestNumberInArray(changesArray))  
// console.log(SmallestNumber)
var BiggestNumber = (+BiggestNumberInArray(changesArray))
// console.log(BiggestNumber)

// Find where a value is indexed in an Array - index of

var SmallestArrayIndex = (+changesArray.indexOf(SmallestNumber));

var BiggestArrayIndex =(+changesArray.indexOf(BiggestNumber));

//find the corrosponding month from the dates array

var CorrospondingMonthProfit = (+BiggestArrayIndex+1)
    console.log("Greatest Increase in Profits: " + NewArrayDates[CorrospondingMonthProfit] + " £" + (BiggestNumber));

var CorrospondingMonthLoss = (+SmallestArrayIndex+1)
    console.log("Greatest Decrease in Profits: " + NewArrayDates[CorrospondingMonthLoss] + " £" + (SmallestNumber));

    
// Your task is to write JavaScript code that analyzes the records to calculate each of the following:

// * The total number of months included in the dataset.

// * The net total amount of Profit/Losses over the entire period.

// * The average of the **changes** in Profit/Losses over the entire period.
//   * You will need to track what the total change in profits are from month to month and then find the average.
//   * (`Total/Number of months`)

// * The greatest increase in profits (date and amount) over the entire period.

// check last increase, if it's bigger than 0 track the change and keep track of the biggest one in a loop. 

// * The greatest decrease in profits(date and amount) over the entire period.

// When you open your code in the browser your resulting analysis should look similar to the following:

//   ```text
//   Financial Analysis
//   ----------------------------
//   Total Months: 25
//   Total: $2561231
//   Average  Change: $-2315.12
//   Greatest Increase in Profits: Feb-2012 ($1926159)
//   Greatest Decrease in Profits: Sep-2013 ($-2196167)
//   ```

// Your final code should print the analysis to the console.