Merge pull request #926 from YusofBandar/master

vectorDistance Snippet

snippets/vectorDistance.md

@@ -0,0 +1,17 @@
+### vectorDistance
+
+Returns the distance between two vectors.
+
+Use `Array.prototype.reduce()`, `Math.pow()` and `Math.sqrt()` to calculate the Euclidean distance between two vectors.
+
+```js
+const vectorDistance = (...coords) => {
+  let pointLength = Math.trunc(coords.length / 2);
+  let sum = coords.slice(0, pointLength).reduce((acc, val, i) => acc + (Math.pow(val - coords[pointLength + i], 2)), 0);
+  return Math.sqrt(sum);
+};
+```
+
+```js
+vectorDistance(10, 0, 5, 20, 0, 10); // 11.180339887498949
+```

tag_database

@@ -332,6 +332,7 @@ URLJoin:string,utility,regexp,advanced
 UUIDGeneratorBrowser:browser,utility,random,intermediate
 UUIDGeneratorNode:node,utility,random,intermediate
 validateNumber:utility,math,intermediate
+vectorDistance:math,beginner
 when:function,intermediate
 without:array,beginner
 words:string,regexp,intermediate

test/vectorDistance.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const { vectorDistance } = require('./_30s.js');
+
+test('vectorDistance is a Function', () => {
+  expect(vectorDistance).toBeInstanceOf(Function);
+});
+test('Calculates the distance between two vectors', () => {
+  expect(distance(10, 0, 5, 20, 0, 10)).toBeCloseTo(11.180339887498949, 5);
+});