Add approximatelyEqual

snippets/approximatelyEqual.md

@@ -0,0 +1,14 @@
+### approximatelyEqual
+
+Checks if two numbers are approximately equal to each other.
+
+Use `Math.abs()` to compare the absolute difference of the two values to `epsilon`.
+Omit the third parameter, `epsilon`, to use a default value of `0.001`.
+
+```js
+const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsilon;
+```
+
+```js
+approximatelyEqual(Math.PI / 2.0 , 1.5708); // true
+```

tag_database

@@ -1,4 +1,5 @@
 anagrams:string,recursion
+approximatelyEqual:math
 arrayToHtmlList:browser,array
 ary:adapter,function
 atob:node,string,utility

test/approximatelyEqual/approximatelyEqual.js

@@ -0,0 +1,2 @@
+const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsilon;
+module.exports = approximatelyEqual;

test/approximatelyEqual/approximatelyEqual.test.js

@@ -0,0 +1,17 @@
+const test = require('tape');
+const approximatelyEqual = require('./approximatelyEqual.js');
+
+test('Testing approximatelyEqual', (t) => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  t.true(typeof approximatelyEqual === 'function', 'approximatelyEqual is a Function');
+  t.true(approximatelyEqual(Math.PI / 2.0 , 1.5708), 'Works for PI / 2');
+  t.true(approximatelyEqual(0.1 + 0.2, 0.3), 'Works for 0.1 + 0.2 === 0.3');
+  t.true(approximatelyEqual(0.5, 0.5), 'Works for exactly equal values');
+  t.true(approximatelyEqual(0.501, 0.5, 0.1), 'Works for a custom epsilon');
+  //t.deepEqual(approximatelyEqual(args..), 'Expected');
+  //t.equal(approximatelyEqual(args..), 'Expected');
+  //t.false(approximatelyEqual(args..), 'Expected');
+  //t.throws(approximatelyEqual(args..), 'Expected');
+  t.end();
+});

test/testlog

@@ -1,4 +1,4 @@
-Test log for: Wed Feb 14 2018 12:33:42 GMT+0200 (GTB Standard Time)
+Test log for: Wed Feb 14 2018 12:46:59 GMT+0200 (GTB Standard Time)
 
 > 30-seconds-of-code@0.0.1 test G:\My Files\git Repositories\30-seconds-of-code
 > tape test/**/*.test.js | tap-spec
@@ -11,6 +11,14 @@ Test log for: Wed Feb 14 2018 12:33:42 GMT+0200 (GTB Standard Time)
     √ Works for single-letter strings
     √ Works for empty strings
 
+  Testing approximatelyEqual
+
+    √ approximatelyEqual is a Function
+    √ Works for PI / 2
+    √ Works for 0.1 + 0.2 === 0.3
+    √ Works for exactly equal values
+    √ Works for a custom epsilon
+
   Testing arrayToHtmlList
 
     √ arrayToHtmlList is a Function
@@ -1839,8 +1847,8 @@ Test log for: Wed Feb 14 2018 12:33:42 GMT+0200 (GTB Standard Time)
     √ Works with multiple promises
 
 
-  total:     919
+  total:     924
-  passing:   919
+  passing:   924
-  duration:  2.4s
+  duration:  2.5s