project: testing (#15)

testing/src/odinTests.js

@@ -0,0 +1,42 @@
+const capitalize = (thing) => thing.charAt(0).toUpperCase() + thing.slice(1);
+const reverseString = (thing) => thing.split('').reverse().join('');
+const calculator = (a, b, operation) => {
+    switch (operation) {
+        case '+':
+            return a + b;
+        case '-':
+            return a - b;
+        case '*':
+            return a * b;
+        case '/':
+            if (b === 0) {
+                return 'error';
+            }
+            return a / b;
+    }
+};
+
+const ceaserCipher = (thing) => {
+    let cipher = thing.split('').map((item) => {
+        let charCode = item.charCodeAt(0);
+        return String.fromCharCode(charCode + 3);
+    });
+
+    return cipher.join('');
+};
+
+const analyzeArray = (arr) => {
+    let min = Math.min(...arr);
+    let max = Math.max(...arr);
+    let length = arr.length;
+    let avg = arr.reduce((sum, num) => sum + num, 0) / length;
+
+    return {
+        average: avg,
+        min: min,
+        max: max,
+        length: length,
+    };
+};
+
+export { analyzeArray, ceaserCipher, calculator, capitalize, reverseString };