Merge pull request #5032 from chrootsu/lodash-round

lodash: added _.round() method

lodash/lodash-tests.ts

@@ -534,6 +534,20 @@ result = <_.LoDashWrapper<number>>_([4, 2, 8, 6]).min();
 result = <_.LoDashWrapper<IStoogesAge>>_(stoogesAges).min(function (stooge) { return stooge.age; });
 result = <_.LoDashWrapper<IStoogesAge>>_(stoogesAges).min('age');
 
+// _.round
+result = <number>_.round(4.006);
+// → 4
+result = <number>_.round(4.006, 2);
+// → 4.01
+result = <number>_.round(4060, -2);
+// → 4100
+result = <number>_(4.006).round();
+// → 4
+result = <number>_(4.006).round(2);
+// → 4.01
+result = <number>_(4060).round(-2);
+// → 4100
+
 result = <number>_.sum([4, 2, 8, 6]);
 result = <number>_.sum([4, 2, 8, 6], function(v) { return v; });
 result = <number>_.sum({a: 2, b: 4});

lodash/lodash.d.ts

@@ -3794,6 +3794,24 @@ declare module _ {
             whereValue: W): LoDashWrapper<T>;
     }
 
+    //_.round
+    interface LoDashStatic {
+        /**
+         * Calculates n rounded to precision.
+         * @param n The number to round.
+         * @param precision The precision to round to.
+         * @return Returns the rounded number.
+         */
+        round(n: number, precision?: number): number;
+    }
+
+    interface LoDashWrapper<T> {
+        /**
+         * @see _.round
+         */
+        round(precision?: number): number;
+    }
+
     //_.sum
     interface LoDashStatic {
         /**