Ian Cameron Arrays in C

[codypeak]

No description provided.

[codejoncode]

Good job so far Ian as we discussed when zoomed calloc would be a better practice for this scenario so you may want to update your code from arr->elements = malloc(capacity * sizeof(char *)); to arr->elements = calloc(capacity, sizeof(char *));

[codejoncode]

Ian 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.

[codejoncode]

char *arr_read(Array *arr, int index) {
  // Throw an error if the index is greater than the current count
  // Otherwise, return the element at the given index
  if (index > arr->count) 
  {
    fprintf(stderr, "index can not be greater than count");
  }
  else
  {
    return arr->elements[index];
  }
}

This should be

char *arr_read(Array *arr, int index) {
  // Throw an error if the index is greater than the current count
  // Otherwise, return the element at the given index
  if (index > arr->count) 
  {
    fprintf(stderr, "index can not be greater than count");
  }
 
  
    return arr->elements[index];
 
}