freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/functional-programming/introduction-to-currying-and-partial-application/index.md

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title: Introduction to Currying and Partial Application
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# Introduction to Currying and Partial Application


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## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

```javascript
function add(x) {
  // Add your code below this line
  return function(y) {
    return function(z) {
      return x + y + z;
    };
  };
  // Add your code above this line
}
add(10)(20)(30);
```
</details>