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50 changes: 25 additions & 25 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,13 +3,13 @@
## Definitions
Define the following:

- Recursion
- Recursive Case
- Base Case
- Activation Chain/Stack
- Activation Record/Call
- Infinite Recursion/Stack Overflow/Stack too deep
- Tail Recursion
- Recursion = method that calls itself within the method; the opposite of iterative
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@sudocrystal sudocrystal Apr 17, 2017

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I wouldn't say "opposite of iterative" maybe "opposed to iterative"

- Recursive Case = a problem that divides the problem into a smaller problem
- Base Case = a problem that can be solved immediately, it returns a result without recursion and is used to stop it
- Activation Chain/Stack = all of the individual recursive calculations for the given value (all of the "bubbles")
- Activation Record/Call = one stack frame, which is the memory used to store local variables; single invocation of a method (each of the "bubbles")
- Infinite Recursion/Stack Overflow/Stack too deep = the recuriosn would never stop, there is no base case
- Tail Recursion = a form of recursive programming, where the recursive call is the last call in any given method
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@sudocrystal sudocrystal Apr 17, 2017

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I didn't actually cover this in class - but may at a later time.


## Tracing through a recursive method

Expand All @@ -24,9 +24,9 @@ def mystery1(n)
end
```

- What is mystery1(5)?
- What is mystery1(10)?
- What is mystery1(0)?
- What is mystery1(5)? 15
- What is mystery1(10)? 55
- What is mystery1(0)? infinite recursion

### Trace #2
```
Expand All @@ -39,9 +39,9 @@ def mystery2(n)
end
```

- What is mystery2(123)?
- What is mystery2(9005)?
- What is mystery2(-123)?
- What is mystery2(123)? 6
- What is mystery2(9005)? 14
- What is mystery2(-123)? -123
- _Added Fun: How could we make `mystery2(-123)` work the way we might expect it to work instead of the way it does?_

### Trace #3
Expand All @@ -60,9 +60,9 @@ def mystery3(n)
end
```

- What is mystery3(1)?
- What is mystery3(13)?
- What is mystery3(-6)?
- What is mystery3(1)? 100
- What is mystery3(13)? 100
- What is mystery3(-6)? 200

### Trace #4
```
Expand All @@ -75,9 +75,9 @@ def mystery4(b,e)
end
```

- What is mystery4(10,2)?
- What is mystery4(4,3)?
- What is mystery4(5,0)?
- What is mystery4(10,2)? 100
- What is mystery4(4,3)? 64
- What is mystery4(5,0)? 1

### Trace #5
```
Expand All @@ -90,9 +90,9 @@ def mystery5(s)
end
```

- What is mystery5("hi")?
- What is mystery5("")?
- What is mystery5("Hi, there!")?
- What is mystery5("hi")? "**"
- What is mystery5("")? ""
- What is mystery5("Hi, there!")? "**********"
- _Added Fun: How could we make only alphabetic characters to be changed to stars?_

### Trace #6
Expand All @@ -110,7 +110,7 @@ def mystery6(s)
end
```

- What is mystery6("goodnight moon")?
- What is mystery6("Ada Developers Academy")?
- What is mystery6("Hi, there!")?
- What is mystery6("goodnight moon")? "moon goodnight"
- What is mystery6("Ada Developers Academy")? "Developers Academy Ada"
- What is mystery6("Hi, there!")? "there! Hi,"
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@sudocrystal sudocrystal Apr 17, 2017

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Minor, but notable: there should be a leading space on each of the answers " moon goodnight", " Academy Developers Ada", " there! Hi,"

- _Added Fun: How could we make the reversal happen by letter, instead of by word (i.e. Make it so that mystery6("goodnight moon") returned "noom thgindoog")?_