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106 lines
2.0 KiB
Markdown
106 lines
2.0 KiB
Markdown
---
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id: 56533eb9ac21ba0edf2244c4
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title: Return Early Pattern for Functions
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challengeType: 1
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forumTopicId: 18272
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dashedName: return-early-pattern-for-functions
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---
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# --description--
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When a `return` statement is reached, the execution of the current function stops and control returns to the calling location.
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**Example**
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```js
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function myFun() {
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console.log("Hello");
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return "World";
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console.log("byebye")
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}
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myFun();
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```
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The above will display the string `Hello` in the console, and return the string `World`. The string `byebye` will never display in the console, because the function exits at the `return` statement.
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# --instructions--
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Modify the function `abTest` so that if `a` or `b` are less than `0` the function will immediately exit with a value of `undefined`.
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**Hint**
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Remember that <a href="https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/understanding-uninitialized-variables" target="_blank" rel="noopener noreferrer nofollow"><code>undefined</code> is a keyword</a>, not a string.
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# --hints--
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`abTest(2, 2)` should return a number
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```js
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assert(typeof abTest(2, 2) === 'number');
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```
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`abTest(2, 2)` should return `8`
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```js
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assert(abTest(2, 2) === 8);
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```
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`abTest(-2, 2)` should return `undefined`
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```js
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assert(abTest(-2, 2) === undefined);
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```
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`abTest(2, -2)` should return `undefined`
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```js
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assert(abTest(2, -2) === undefined);
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```
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`abTest(2, 8)` should return `18`
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```js
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assert(abTest(2, 8) === 18);
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```
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`abTest(3, 3)` should return `12`
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```js
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assert(abTest(3, 3) === 12);
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```
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`abTest(0, 0)` should return `0`
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```js
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assert(abTest(0, 0) === 0);
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```
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# --seed--
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## --seed-contents--
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```js
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// Setup
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function abTest(a, b) {
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// Only change code below this line
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// Only change code above this line
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return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 2));
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}
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abTest(2,2);
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```
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# --solutions--
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```js
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function abTest(a, b) {
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if(a < 0 || b < 0) {
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return undefined;
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}
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return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 2));
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}
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```
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