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HashMap Data Structure: Add link to pure function explaination #30165

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HashMap Data Structure: Add link to pure function explaination #30165

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2 changes: 1 addition & 1 deletion javascript/computer_science/hash_map_data_structure.md
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Expand Up @@ -13,7 +13,7 @@ This section contains a general overview of topics that you will learn in this l

### What is a hash code?

Let's start by learning what it means to hash a value. Hashing involves taking an input in and generating a corresponding output. A hash function should be a pure function. Hashing the same input should always return the same hash code, and there should be no random generation component. For example, let's look at a hashing function that takes a name and gives us the first letter of that name:
Let's start by learning what it means to hash a value. Hashing involves taking an input in and generating a corresponding output. A hash function should be a [pure function](https://en.wikipedia.org/wiki/Pure_function). Hashing the same input should always return the same hash code, and there should be no random generation component. For example, let's look at a hashing function that takes a name and gives us the first letter of that name:

```javascript
function hash(name) {
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