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Replaces references to indexOf(_:) with index(of:). #696

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Mar 11, 2018
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Replaces references to indexOf(_:) with index(of:). #696

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6 changes: 3 additions & 3 deletions Binary Search/README.markdown
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Expand Up @@ -4,15 +4,15 @@ Goal: Quickly find an element in an array.

Let's say you have an array of numbers and you want to determine whether a specific number is in that array, and if so, at which index.

In most cases, Swift's `indexOf()` function is good enough for that:
In most cases, Swift's `Collection.index(of:)` function is good enough for that:

```swift
let numbers = [11, 59, 3, 2, 53, 17, 31, 7, 19, 67, 47, 13, 37, 61, 29, 43, 5, 41, 23]

numbers.indexOf(43) // returns 15
numbers.index(of: 43) // returns 15
```

The built-in `indexOf()` function performs a [linear search](../Linear%20Search/). In code that looks something like this:
The built-in `Collection.index(of:)` function performs a [linear search](../Linear%20Search/). In code that looks something like this:

```swift
func linearSearch<T: Equatable>(_ a: [T], _ key: T) -> Int? {
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