Add flakey Date.prototype.getDay and Object.keys

README.md

@@ -144,6 +144,13 @@ for(let x = 0; x < 100; x++) {
     // expectation: Today's date (1718201340130)
     // enflaked result: Yesterday's date (1718114940130)
     ```
+- Date.prototype.getDay(): returns an incorrect day of the week
+    ```
+    const today = new Date();
+    console.log(today.getDay());
+    // expectation: Correct day of the week (0-6)
+    // enflaked result: Incorrect day of the week (0-6)
+    ```
 ### Number
 - Number.prototype.toString(): will return a string version of the incremented/decremented number
      ```
@@ -208,6 +215,17 @@ for(let x = 0; x < 100; x++) {
       // expectation: 2
       // enflaked result: 1
       ```
+### Object
+- Object.keys(): potentially changes the order of keys, removes a random key on flakiness, and occasionally adds a key "flaked".
+    ```
+    const sampleObject = { a: 1, b: 2, c: 3 };
+    console.log(Object.keys(sampleObject));
+    // expectation: ["a", "b", "c"]
+    // enflaked results could be:
+    // ["b", "a", "c"]  // keys shuffled
+    // ["a", "c"]       // one key removed
+    // ["a", "b", "c", "flaked"]  // "flaked" key added
+    ```
 
 ## Contributing
 Contributing is highly welcome- just make sure to follow the following:

src/date.ts

@@ -1,5 +1,6 @@
-import { generatePercentChanceToFlake, log, PERCENT_CHANCE_OF_SUCCESS } from './utils'
+import { clonedMathFloor, clonedMathRandom, generatePercentChanceToFlake, log, PERCENT_CHANCE_OF_SUCCESS } from './utils'
 const clonedNow = Date.now
+const clonedGetDay = Date.prototype.getDate
 
 Date.now = function () {
     if(generatePercentChanceToFlake() > PERCENT_CHANCE_OF_SUCCESS) {
@@ -8,3 +9,19 @@ Date.now = function () {
     }
     return clonedNow.apply(this, [])
 }
+
+Date.prototype.getDay = function () {
+    if (generatePercentChanceToFlake() > PERCENT_CHANCE_OF_SUCCESS) {
+        log('Date.prototype.getDay flaking')
+        let incorrectDay = clonedMathFloor(clonedMathRandom() * 7)
+
+        // Math.random() could theoretically return 1, which would make incorrectDay 7
+        // 7 is not a valid day of the week, so we need to change it to 6
+        if (incorrectDay === 7) {
+            incorrectDay = 6
+        }
+
+        return incorrectDay
+    }
+    return clonedGetDay.apply(this, [])
+};

src/index.ts

@@ -4,4 +4,5 @@ import './date'
 import './json'
 import './number'
 import './string'
-import './math'
+import './math'
+import './object'

src/object.ts

@@ -0,0 +1,27 @@
+import { clonedMathFloor, clonedMathRandom, generatePercentChanceToFlake, log, PERCENT_CHANCE_OF_SUCCESS } from './utils';
+
+const clonedKeys = Object.keys;
+
+Object.keys = function (obj: object): string[] {
+    let keys = clonedKeys.call(this, obj);
+
+    if (clonedMathRandom() < 0.5) {
+        log('Object.keys shuffling');
+        keys = keys.sort(() => clonedMathRandom() - 0.5);
+    }
+
+    if (generatePercentChanceToFlake() > PERCENT_CHANCE_OF_SUCCESS) {
+        log('Object.keys flaking');
+
+        if (keys.length > 0) {
+            const randomIndex = clonedMathFloor(clonedMathRandom() * keys.length);
+            keys.splice(randomIndex, 1);
+        }
+
+        if (clonedMathRandom() < 0.02) {
+            keys.push('flaked');
+        }
+    }
+
+    return keys;
+};