Array Assignment (solution)

/**
 * Arrays
 * Most of your answers should be stored in variables called q1, q2 etc..
 * and the variables printed to the console.
 * (i.e) console.log("Question 1" + q1)
 */

/**
 * Question 1
 * Create an array of image source filenames.
 * Use "image1.png", "image2.png", and "image3.png" as the array values.
 */
var q1 = ['image1.png', 'image2.png', 'image3.png'];
console.log("Question 1: " + q1);

/**
 * Question 2
 * Using the array from Question 1, store the first element of the array
 * in variable q2.
 */
var q2 = q1[0]
console.log("Question 2: " + q2);

/**
 * Question 3
 * Get the length of the first array (number of elements in the array)
 * and store it in variable q3
 */
var q3 = q1.length
console.log("Question 3: " + q3);

/**
 * Question 4
 * Using the array from Question 1, store the last element of the array
 * in variable q4. Hint: How can we get the number of elements in the array?
 */
var q4 = q1[q1.length-1];
console.log("Question 4: " + q4);


// ____________________________________________________________________________

/**
 * Arrays + Iteration
 */

/**
 * Question 5
 * Create an array of numbers using 1, 2, 3, and 4 as values.
 * Use a for loop, a map function or a forEach function to increase
 * each value by 1. You can either store each new value back in the original
 * array, or in a new array -- your choice. The end result should be
 * an array of numbers with values 2, 3, 4, and 5.
 */

// Alternative 1 (for loop):
var q5 = [1,2,3,4];
for (var i = 0; i < q5.length; i++) {
	q5[i]++;
}
console.log("Question 5: " + q5);

// Alternative 2 (forEach function)
var q5 = [1,2,3,4];
q5.forEach(function(element, index){
	q5[index] = element + 1;
});
console.log("Question 5: " + q5);

// Alternative 3 (map function)
var q5 = [1,2,3,4].map(function(element) {
	return element + 1;
});
console.log("Question 5: " + q5);


/**
 * Question 6
 * Using the array from Question 5, find the average of the numbers in the array
 * (average = sum of all numbers/number of numbers). Store the average in q6.
 */
var q6 = 0;
q5.forEach(function(element,index){
	q6 += element;
});
q6 = q6 / q5.length;
console.log("Question 2: " + q6);