Travis build: 559

README.md

@@ -251,10 +251,16 @@ average(1, 2, 3);
 <details>
 <summary>View contents</summary>
 
+* [`dayOfYear`](#dayofyear)
 * [`formatDuration`](#formatduration)
 * [`getColonTimeFromDate`](#getcolontimefromdate)
 * [`getDaysDiffBetweenDates`](#getdaysdiffbetweendates)
 * [`getMeridiemSuffixOfInteger`](#getmeridiemsuffixofinteger)
+* [`isAfterDate`](#isafterdate)
+* [`isBeforeDate`](#isbeforedate)
+* [`isSameDate`](#issamedate)
+* [`maxDate`](#maxdate)
+* [`minDate`](#mindate)
 * [`tomorrow`](#tomorrow)
 
 </details>
@@ -4196,6 +4202,29 @@ UUIDGeneratorBrowser(); // '7982fcfe-5721-4632-bede-6000885be57d'
 
 ## ⏱️ Date
 
+### dayOfYear
+
+Gets the day of the year from a `Date` object.
+
+Use `new Date()` and `Date.prototype.getFullYear()` to get the first day of the year as a `Date` object, subtract it from the provided `date` and divide with the milliseconds in each day to get the result.
+Use `Math.floor()` to appropriately round the resulting day count to an integer.
+
+```js
+const dayOfYear = date =>
+  Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+dayOfYear(new Date()); // 272
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### formatDuration
 
 Returns the human readable format of the given number of milliseconds.
@@ -4308,6 +4337,123 @@ getMeridiemSuffixOfInteger(25); // "1pm"
 
 <br>[⬆ Back to top](#table-of-contents)
 
+### isAfterDate
+
+Check if a date is after another date.
+
+Use the greater than operator (`>`) to check if the first date comes after the second one.
+
+```js
+const isAfterDate = (dateA, dateB) => dateA > dateB;
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+isAfterDate(new Date(2010, 10, 21), new Date(2010, 10, 20)); // true
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### isBeforeDate
+
+Check if a date is before another date.
+
+Use the less than operator (`<`) to check if the first date comes before the second one.
+
+```js
+const isBeforeDate = (dateA, dateB) => dateA < dateB;
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+isBeforeDate(new Date(2010, 10, 20), new Date(2010, 10, 21)); // true
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### isSameDate
+
+Check if a date is the same as another date.
+
+Use `Date.prototype.toISOString()` and strict equality checking (`===`) to check if the first date is the same as the second one.
+
+```js
+const isSameDate = (dateA, dateB) => dateA.toISOString() === dateB.toISOString();
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+isSameDate(new Date(2010, 10, 20), new Date(2010, 10, 20)); // true
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### maxDate
+
+Returns the maximum of the given dates.
+
+Use `Math.max.apply()` to find the maximum date value, `new Date()` to convert it to a `Date` object.
+
+```js
+const maxDate = (...dates) => new Date(Math.max.apply(null, ...dates));
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+const array = [
+  new Date(2017, 4, 13),
+  new Date(2018, 2, 12),
+  new Date(2016, 0, 10),
+  new Date(2016, 0, 9)
+];
+maxDate(array); // 2018-03-11T22:00:00.000Z
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### minDate
+
+Returns the minimum of the given dates.
+
+Use `Math.min.apply()` to find the minimum date value, `new Date()` to convert it to a `Date` object.
+
+```js
+const minDate = (...dates) => new Date(Math.min.apply(null, ...dates));
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+const array = [
+  new Date(2017, 4, 13),
+  new Date(2018, 2, 12),
+  new Date(2016, 0, 10),
+  new Date(2016, 0, 9)
+];
+minDate(array); // 2016-01-08T22:00:00.000Z
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### tomorrow
 
 Results in a string representation of tomorrow's date.

snippets/compose.md

@@ -12,6 +12,9 @@ const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));
 ```js
 const add5 = x => x + 5;
 const multiply = (x, y) => x * y;
-const multiplyAndAdd5 = compose(add5, multiply);
+const multiplyAndAdd5 = compose(
+  add5,
+  multiply
+);
 multiplyAndAdd5(5, 2); // 15
 ```

snippets/degreesToRads.md

@@ -5,7 +5,7 @@ Converts an angle from degrees to radians.
 Use `Math.PI` and the degree to radian formula to convert the angle from degrees to radians.
 
 ```js
-const degreesToRads = deg => deg * Math.PI / 180.0;
+const degreesToRads = deg => (deg * Math.PI) / 180.0;
 ```
 
 ```js

snippets/getMeridiemSuffixOfInteger.md

@@ -11,8 +11,8 @@ const getMeridiemSuffixOfInteger = num =>
     : num === 12
       ? 12 + 'pm'
       : num < 12
-        ? num % 12 + 'am'
-        : num % 12 + 'pm';
+        ? (num % 12) + 'am'
+        : (num % 12) + 'pm';
 ```
 
 ```js

snippets/hz.md

@@ -11,7 +11,7 @@ Omit the second argument, `iterations`, to use the default of 100 iterations.
 const hz = (fn, iterations = 100) => {
   const before = performance.now();
   for (let i = 0; i < iterations; i++) fn();
-  return 1000 * iterations / (performance.now() - before);
+  return (1000 * iterations) / (performance.now() - before);
 };
 ```
 

snippets/lcm.md

@@ -8,7 +8,7 @@ The GCD formula uses recursion.
 ```js
 const lcm = (...arr) => {
   const gcd = (x, y) => (!y ? x : gcd(y, x % y));
-  const _lcm = (x, y) => x * y / gcd(x, y);
+  const _lcm = (x, y) => (x * y) / gcd(x, y);
   return [...arr].reduce((a, b) => _lcm(a, b));
 };
 ```

snippets/luhnCheck.md

@@ -15,7 +15,7 @@ const luhnCheck = num => {
     .reverse()
     .map(x => parseInt(x));
   let lastDigit = arr.splice(0, 1)[0];
-  let sum = arr.reduce((acc, val, i) => (i % 2 !== 0 ? acc + val : acc + (val * 2) % 9 || 9), 0);
+  let sum = arr.reduce((acc, val, i) => (i % 2 !== 0 ? acc + val : acc + ((val * 2) % 9) || 9), 0);
   sum += lastDigit;
   return sum % 10 === 0;
 };

snippets/percentile.md

@@ -6,7 +6,7 @@ Use `Array.prototype.reduce()` to calculate how many numbers are below the value
 
 ```js
 const percentile = (arr, val) =>
-  100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0) / arr.length;
+  (100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0)) / arr.length;
 ```
 
 ```js

snippets/radsToDegrees.md

@@ -5,7 +5,7 @@ Converts an angle from radians to degrees.
 Use `Math.PI` and the radian to degree formula to convert the angle from radians to degrees.
 
 ```js
-const radsToDegrees = rad => rad * 180.0 / Math.PI;
+const radsToDegrees = rad => (rad * 180.0) / Math.PI;
 ```
 
 ```js