Arrays - Evan Carlstrom

[ecarlstrom]

No description provided.

[codejoncode]

Great job so far Evan, better practice to set all allocated data to NULL.

arr->elements = calloc(capacity, sizeof(char *)); in your create _array function
https://www.tutorialspoint.com/c_standard_library/c_function_calloc.htm
https://stackoverflow.com/questions/8106782/when-should-i-use-calloc-over-malloc

[codejoncode]

Evan for your arr_append method consider the following:

 ```// Copy the element and add it to the end of the array
  char *new_element = strdup(element);
  //strudup is malloc and strcpy combined together  
  //allocates memory for the size of the string and then copys the string

  arr->elements[arr->count] = new_element;```

is preferred over 'arr->elements[arr->count] = element' where element is the string passed in.

This is because if you don't make a copy of the of the element then if the original string is changed your array will be affected by this.

Take this Python code in consideration:

```temp = {"number": None}

arr = [] 

for x in range(2):
  temp["number"] = x
  arr.append(temp)

print(arr)```

And this is why we are learning C the final output will look like this: [{'number': 1}, {'number': 1}]

So the last update to "number" affected both index's because they both point to the same thing in memory.
https://repl.it/@codejoncode/AlienatedLinenLevel <<< play with it yourself.