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---
title: Set Default Parameters for Your Functions
---
## Set Default Parameters for Your Functions
Remember to use Read-Search-Ask if you get stuck. Try to pair program and write your own code.
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### Problem Explanation:
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```javascript
const increment = (function() {
"use strict";
return function increment(number, value) {
return number + value;
};
})();
console.log(increment(5, 2)); // returns 7
console.log(increment(5)); // returns NaN
```
We'll be modifying the increment function so that the **number** parameter is incremented by 1 by default, by setting **value** to 1 if a value for **value** is not passed to the increment function.
### Hint: 1
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Let's identify where the parameter **value** is in JS function
try to solve the problem now
### Hint: 2
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Set **value** equal to something so that it is that value by default
try to solve the problem now
### Spoiler Alert!
Solution ahead!
## Basic Code Solution:
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```javascript
const increment = (function() {
"use strict";
return function increment(number, value = 1) {
return number + value;
};
})();
console.log(increment(5, 2)); // returns 7
console.log(increment(5)); // returns NaN
```
[Run Code](https://repl.it/@RyanPisuena/PleasingFumblingThings)
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### Code Explanation
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* This section is pretty straightforward. Pass this section by setting the **value** parameter equal to 1. When the function comes across test cases where **value** has not been passed anything, then **value** will be assigned one by default.
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Relevant Links:
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[JavaScript default parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters)
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## NOTES FOR CONTRIBUTIONS:
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* DO NOT add solutions that are similar to any existing solutions. If you think it is similar but better, then try to merge (or replace) the existing similar solution.
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* Add an explanation of your solution.
* Categorize the solution in one of the following categories — Basic, Intermediate and Advanced.