How do I pick the first four letters of a string?

Picking the first four letters of a string is a common task in programming. Here's how you can achieve this in various languages:

1. JavaScript:

- You can use the substring() or slice() methods.

let str = "HelloWorld";
let firstFour = str.substring(0, 4); // Returns "Hell"
// OR
let firstFourSlice = str.slice(0, 4); // Returns "Hell"
console.log(firstFour);
console.log(firstFourSlice);

- Both substring(0, 4) and slice(0, 4) extract characters from index 0 up to (but not including) index 4.

2. Python:

- Python uses slicing for this purpose.

str = "HelloWorld"
first_four = str[0:4] # Returns "Hell"
print(first_four)

- The syntax str[0:4] extracts characters from index 0 up to (but not including) index 4.

3. Java:

- Java uses the substring() method.

String str = "HelloWorld";
String firstFour = str.substring(0, 4); // Returns "Hell"
System.out.println(firstFour);

- Similar to JavaScript, substring(0, 4) extracts characters from index 0 up to (but not including) index 4.

4. C#:

- C# also uses the Substring() method.

string str = "HelloWorld";
string firstFour = str.Substring(0, 4); // Returns "Hell"
Console.WriteLine(firstFour);

- The Substring(0, 4) method works the same way as in Java, extracting characters from index 0 up to (but not including) index 4.

5. PHP:

- PHP uses the substr() function.

$str = "HelloWorld";
$firstFour = substr($str, 0, 4); // Returns "Hell"
echo $firstFour;

- The substr($str, 0, 4) function extracts characters from index 0 for a length of 4.

In all these examples, if the string is shorter than four characters, the methods will return the available characters without causing an error. For example, if the string is "Hi", the result will be "Hi".

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