Added easy/number_addition

bradhanson · bradhanson · commit f3ffada8ed1a · 2018-07-30T15:49:04.000-07:00
diff --git a/easy/number_addition.js b/easy/number_addition.js
@@ -0,0 +1,43 @@
+/**
+ * Have the function numberAddition(str) take the str parameter, search for all
+ * the numbers in the string, add them together, then return that final number.
+ * For example: if str is "88Hello 3World!" the output should be 91. You will
+ * have to differentiate between single digit numbers and multiple digit numbers
+ * like in the example above. So "55Hello" and "5Hello 5" should return two
+ * different answers. Each string will contain at least one letter or symbol.
+ *
+ * https://www.coderbyte.com/results/bhanson:Number%20Addition:JavaScript
+ *
+ * @param  {string} str
+ * @return {number}
+ */
+function numberAddition(str) {
+    const DIGITS = '0123456789';
+
+    let numbers = [];
+
+    // First find numbers
+    for (let i = 0, number = ''; i < str.length; i++) {
+        if (!DIGITS.includes(str[i])) {
+            if (number !== '') {
+                numbers.push(number);
+            }
+            number = '';
+        } else {
+            number += str[i];
+
+            // Special case for last char
+            if (i === str.length - 1) {
+                numbers.push(number);
+            }
+        }
+    }
+
+    let sum = 0;
+    for (let i = 0; i < numbers.length; i++) {
+        sum += parseInt(numbers[i]);
+    }
+    return sum;
+}
+
+module.exports = numberAddition;
diff --git a/easy/number_addition.test.js b/easy/number_addition.test.js
@@ -0,0 +1,11 @@
+const numberAddition = require('./number_addition');
+
+describe('numberAddition()', () => {
+    test('adds separated single digits in string', () => {
+        expect(numberAddition('5fad4fadfa6')).toBe(15);
+    });
+
+    test('treats consecutive digits as one number', () => {
+        expect(numberAddition('28ad 11 fd as22dfa19')).toBe(80);
+    });
+});
