Add roundOffFloat helper method

app/assets/javascripts/lib/utils/common_utils.js

@@ -541,6 +541,26 @@ export const addSelectOnFocusBehaviour = (selector = '.js-select-on-focus') => {
   });
 };
 
+/**
+ * Method to round of values with decimal places
+ * with provided precision.
+ *
+ * Taken from https://stackoverflow.com/a/7343013/414749
+ *
+ * Eg; roundOffFloat(3.141592, 3) = 3.142
+ *
+ * Refer to spec/javascripts/lib/utils/common_utils_spec.js for
+ * more supported examples.
+ *
+ * @param {Float} number
+ * @param {Number} precision
+ */
+export const roundOffFloat = (number, precision = 0) => {
+  // eslint-disable-next-line no-restricted-properties
+  const multiplier = Math.pow(10, precision);
+  return Math.round(number * multiplier) / multiplier;
+};
+
 window.gl = window.gl || {};
 window.gl.utils = {
   ...(window.gl.utils || {}),

spec/javascripts/lib/utils/common_utils_spec.js

@@ -627,4 +627,23 @@ describe('common_utils', () => {
       });
     });
   });
+
+  describe('roundOffFloat', () => {
+    it('Rounds off decimal places of a float number with provided precision', () => {
+      expect(commonUtils.roundOffFloat(3.141592, 3)).toBe(3.142);
+    });
+
+    it('Rounds off a float number to a whole number when provided precision is zero', () => {
+      expect(commonUtils.roundOffFloat(3.141592, 0)).toBe(3);
+      expect(commonUtils.roundOffFloat(3.5, 0)).toBe(4);
+    });
+
+    it('Rounds off float number to nearest 0, 10, 100, 1000 and so on when provided precision is below 0', () => {
+      expect(commonUtils.roundOffFloat(34567.14159, -1)).toBe(34570);
+      expect(commonUtils.roundOffFloat(34567.14159, -2)).toBe(34600);
+      expect(commonUtils.roundOffFloat(34567.14159, -3)).toBe(35000);
+      expect(commonUtils.roundOffFloat(34567.14159, -4)).toBe(30000);
+      expect(commonUtils.roundOffFloat(34567.14159, -5)).toBe(0);
+    });
+  });
 });