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Update midpoint.md

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Angelos Chalaris
2018-12-07 18:23:29 +02:00
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### midpoint
Calculates the midpoint between two pairs of x and y points.
Calculates the midpoint between two pairs of (x,y) points.
Takes in two pairs of (x,y) points, calculates the midpoint between the x's, the midpoint between the y's, and returns the coordinates in an array.
Destructure the array to get `x1`, `y1`, `x2` and `y2`, calculate the midpoint for each dimension by dividing the sum of the two endpoints by `2`.
```js
const midpoint = (x1, y1, x2, y2) => {
let points = new Array(2);
let first_point = (x1 + x2) / 2;
let second_point = (y1 + y2) / 2;
points[0] = first_point;
points[1] = second_point;
return points;
};
const midpoint = ([x1, y1], [x2, y2]) => [(x1 + x2) / 2, (y1 + y2) / 2];
```
```js
midpoint(2, 2, 4, 4); // [3, 3]
midpoint(4, 4, 6, 6); // [5, 5]
midpoint(1, 3, 2, 4); // [1.5, 3.5]
midpoint([2, 2], [4, 4]); // [3, 3]
midpoint([4, 4], [6, 6]); // [5, 5]
midpoint([1, 3], [2, 4]); // [1.5, 3.5]
```