Javascript — Week 2

jsd4-2.js

// 1. What's the max number?

var max = 0;
for (var i = 0; i < a.length; i++) {
	if(a[i] > max) {
		max = a[i];
	}	
}
console.log("max number is " + max);

// 2. What's the sum of all the numbers?

var sum = 0;
for (var i = 0; i < a.length; i++) {
	sum = sum + a[i];
}
console.log("sum: " + sum);

// 3. Which numbers are between 50 and 100?

var numbers = [];
for (var i = 0; i < a.length; i++) {
	if (a[i] > 50 && a[i] < 100) {
		numbers.push(a[i]);
	}
}
console.log("numbers between 50 and 100: " + numbers);

// 4. How many numbers greater than 500?

var greaterThan500 = 0;
for (var i = 0; i < a.length; i++) {
	if (a[i] > 500) {
		greaterThan500++;
	}
}
console.log("numbers greater than 500: " + greaterThan500);


// 5. How many even numbers?

var even = [];
for (var i = 0; i < a.length; i++) {
	if ((a[i] % 2) == 0) {
		even.push(a[i]);
	}
}
console.log("even numbers: " + even.length);

// 6. How many odd numbers?

var odd = 0;
for (var i = 0; i < a.length; i++) {
	if ((a[i] % 2) == 1) {
		odd++;
	}
}
console.log("odd numbers: " + odd);

// 7. What's the largest even number?

var maxEven = 0;
for (var i = 0; i < a.length; i++) {
	if ((a[i] % 2) == 0) {
		if(a[i] > maxEven) {
			maxEven = a[i];
		}	
	}	
}
console.log("max even is " + maxEven);

// 8. How many numbers, whose sum of digits is greater than 10?

// Solution 1

var breakApart;
var greaterThan10 = 0;
for (var i = 0; i < a.length; i++) {

	breakApart = a[i].toString()
	breakApart = breakApart.split("");
	var sumOfValue = 0;
	for (var j = 0; j < breakApart.length; j++) {
		sumOfValue += parseInt(breakApart[j]);
	}

	if (sumOfValue > 10) {
		greaterThan10++;
	}
}
console.log("greater than 50: " + greaterThan10);

// Solution 2

a.forEach(findSum);

function findSum(item) {
	var digits = item.toString();
	digits = digits.split("");

	var sumOfDigits = 0;
	digits.forEach(addDigits);
	function addDigits(item) {
		sumOfDigits = sumOfDigits + parseInt(item);
	}

	if (sumOfDigits > 10) {
		greaterThan10++;
	}

}
console.log("greater than 50: " + greaterThan10);