Day4 Count Objects

Objective

In this challenge, we learn about iterating over objects. Check the attached tutorial for more details.

Task

Complete the function in the editor. It has one parameter: an array, a, of objects. Each object in the array has two integer properties denoted by x and y. The function must return a count of all such objects o in array a that satisfy o.x = o.y.

Constraints

• 5 <= n <= 10
• 1 <= x,y <= 100

Output Format

Return a count of the total number of objects o such that o.x = o.y. Locked stub code in the editor prints the returned value to STDOUT.

Sample Input 0

1
2
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5
6

5
1 1
2 3
3 3
3 4
4 5

Sample Output 0

1

2

Explanation 0

There are n = 5 objects in the objects array:

• Objects[0] = {x: 1, y: 1}
• Objects[1] = {x: 2, y: 3}
• Objects[2] = {x: 3, y: 3}
• Objects[3] = {x: 4, y: 4}
• Objects[4] = {x: 5, y: 5}

Because we have two objects o that satisfy o.x = o.y (i.e., Objects[0] and Objects[2]), we return 2 as our answer.

Solution

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/*
 * Return a count of the total number of objects 'o' satisfying o.x == o.y.
 * 
 * Parameter(s):
 * objects: an array of objects with integer properties 'x' and 'y'
 */
function getCount(objects) {
    return objects.reduce((target, item) => {
        (item.x === item.y) && (target += 1);
        
        return target;
    }, 0);
}