# Array in for loop x1 x2 x3 x4 into x1 x2 x2 x3 x3 x4 python

The given problem requires us to convert an array into a string where each element is repeated once. We can solve this problem in different ways using Python. Let’s explore three different approaches to solve this problem.

## Approach 1: Using a Set

``````def convert_array(arr):
unique_elements = set(arr)
result = ' '.join(unique_elements)
return result

# Example usage
arr = ['x1', 'x2', 'x3', 'x4']
output = convert_array(arr)
print(output)``````

In this approach, we convert the array into a set to remove duplicate elements. Then, we join the elements of the set using a space as a separator to form the desired string. This approach ensures that each element appears only once in the output string.

## Approach 2: Using a Dictionary

``````def convert_array(arr):
unique_elements = {}
for element in arr:
unique_elements[element] = 1
result = ' '.join(unique_elements.keys())
return result

# Example usage
arr = ['x1', 'x2', 'x3', 'x4']
output = convert_array(arr)
print(output)``````

In this approach, we use a dictionary to store the unique elements of the array as keys. We iterate over the array and add each element as a key in the dictionary. Finally, we join the keys of the dictionary using a space as a separator to form the desired string.

## Approach 3: Using a List

``````def convert_array(arr):
unique_elements = []
for element in arr:
if element not in unique_elements:
unique_elements.append(element)
result = ' '.join(unique_elements)
return result

# Example usage
arr = ['x1', 'x2', 'x3', 'x4']
output = convert_array(arr)
print(output)``````

In this approach, we use a list to store the unique elements of the array. We iterate over the array and check if each element is already present in the list. If not, we append it to the list. Finally, we join the elements of the list using a space as a separator to form the desired string.

Among the three options, Approach 1 using a set is the better solution. It provides a concise and efficient way to remove duplicate elements from the array and convert it into a string. Additionally, using a set ensures that the order of the elements in the output string is not affected.

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### 6 Responses

1. Iliana Stephenson says:

Approach 2: Using a Dictionary sounds cool, but can we add a twist with Approach 4: Using a Tuple? 🤔💡

2. Saul says:

Approach 3: Using a List seems more straightforward, but maybe Approach 1 has hidden perks? 🤔

3. Lennox says:

Approach 2: Using a Dictionary sounds cool, but can Approach 3: Using a List be a hidden gem? 🤔💎

4. Evander says:

Why not just use a list comprehension? So much simpler!

5. Damon Alvarez says:

Approach 2 looks promising, but cant we just use a magical unicorn instead? 🦄

6. Carson says:

Approach 2 seems cool, but Im curious about Approach 3. Any thoughts, peeps? 🤔