// Homework 1

// Hint: You may need SOME of these array iterator methods:
// .map(), .filter(), .forEach() , .some(), .every()
// Hint: You may also need SOME of the following methods:
// Number(), .reverse(), typeof(), .join()

// Let's say we have an array of prices named `prices`.
var prices = ['100', '125', '129', '37', '38', '75', '87', '94', '300', '301',
	'305', '50', '0.30', '0.01', '0.5', '5', '15', '24', '35', '1041', '1', '17',
	'21', '28', '97', '6', '10', '49', '65', '89', '6', '10', '49', '65', '89'];

// Question 1
// Convert every price in `prices` into a number using a function that returns an array.
// Store the resulting array in a variable named `numPricesArray`. You should not mutuate `prices`.
// To see your work, log out the string "numPricesArray" and the actual variable afterwards.

// WRITE QUESTION 1 ANSWER HERE

var numPricesArray = prices.map(function(num){
	return parseInt(num);
});
// console.log( prices );
console.log( "numPricesArray = " + numPricesArray );

// Question 2
// Check that all the elements in `numPricesArray` are numbers.
// Your code will return a boolean, so store that boolean in a variable named `onlyPrices`.
// Log out the string "onlyPrices" and the actual variable.
// If the value of the `onlyPrices` is not true, your answer to question 1, question 2, or both is incorrect.

// WRITE QUESTION 2 ANSWER HERE

var onlyPrices = numPricesArray.every(function(num){
	return ( typeof num==='number' /* && (num%1)===0 */ );
});
console.log( "onlyPrices = " + onlyPrices );

// Question 3
// At this point, we've confirmed that all the elements in `numPricesArray` are numbers.
// Now that we've done that check, we can safely compare against those elements as numbers.
// We're on a budget here so check if any of the prices are less than $25. Store this value in a variable named `cutoffPrice`.
// Store the boolean in a variable named `lowPricesPresent`, and log it out like the previous questions.
// Hint: Do not compare against "$25" or $25.
// Hint: We can inspect the array with our eyes, so `lowPricesPresent` should be true.

// WRITE QUESTION 3 ANSWER HERE

var cutOffPrice = numPricesArray.some(function(num){
	return num < 25;
});
var lowPricesPresent = cutOffPrice;
console.log( "lowPricesPresent = " + lowPricesPresent );

// Question 4
// Hey, we can buy things! Whoo!
// Let's filter out all the prices that are greater than our cutoff.
// (We're feeling splurgy, so our cutoff price is fair game.)
// Store these prices in a variable named `inBudgetPrices`.
// Be sure to log it out like the previous questions.

// WRITE QUESTION 4 ANSWER HERE

var inBudgetPrices = numPricesArray.filter(function(num){
	return num < 100;
});
console.log( "inBudgetPrices = " + inBudgetPrices );

// Question 5
// The good news is we bought everything in `inBudgetPrices`.
// The bad news is our accountant is a huge jerk, so we can't give him the array `inBudgetPrices`.
// He wants a string of the prices, with each price separated by a comma and a space.
// Store the string of the prices in a new variable with a name of your choosing.
// Be sure to camelCase the variable name! Our accountant expects it.

// WRITE QUESTION 5 ANSWER HERE

var jerkAccountant = inBudgetPrices.join(", ");
console.log( jerkAccountant );

// Extra Credit 1 (OPTIONAL)
// Create a new array that has "$" prepended before each price in `inBudgetPrices`.
// What is the type of the elements in `inBudgetPrices` now?

// WRITE EXTRA CREDIT 1 ANSWER HERE
/*
var dollarSign = inBudgetPrices.forEach(function(num, index, dollarSign){
	dollarSign[index] = "$" + dollarSign[index];
});
console.log("dollarSign = " + dollarSign);
*/
var dollarSign = [];
for( var i = 0; i < inBudgetPrices.length; i++ ){
    dollarSign.push( inBudgetPrices[i] = "$" + inBudgetPrices[i] );
}
console.log( "dollarSign = " + dollarSign );


// Extra Credit 2
// Create a new array based off of `numPricesArray` that has:
// * one "$" prepended before a price that is greater than or equal to 0
// * two "$" prepended before a price that is greater than or equal to 10
// * three "$" prepended before a price that is greater than or equal to 100

// WRITE EXTRA CREDIT 2 ANSWER HERE

var multipleDollarSigns = [];
for( var i = 0; i < numPricesArray.length; i++ ){
	if ( numPricesArray[i] <= 10 ) {
		multipleDollarSigns.push( numPricesArray[i] = "$" + numPricesArray[i] );
	} else if ( numPricesArray[i] <= 100 ) {
		multipleDollarSigns.push( numPricesArray[i] = "$$" + numPricesArray[i] );
	} else {
		multipleDollarSigns.push( numPricesArray[i] = "$$$" + numPricesArray[i] );
	}
}
console.log("multipleDollarSigns = " + multipleDollarSigns);