Question

How do I correctly insert the value of a variable into a string using string interpolation?

Answer 1

In many programming languages, string interpolation allows you to embed variable values directly within a string. Here are examples for several popular languages:

### 1. **Python**
You can use f-strings (formatted string literals) in Python 3.6 and later:

```python
name = "Alice"
greeting = f"Hello, {name}!"
print(greeting) # Output: Hello, Alice!
```

### 2. **JavaScript**
Template literals in JavaScript allow you to interpolate variables using backticks:

```javascript
let name = "Alice";
let greeting = `Hello, ${name}!`;
console.log(greeting); // Output: Hello, Alice!
```

### 3. **Ruby**
You can use `#{}` within double-quoted strings:

```ruby
name = "Alice"
greeting = "Hello, #{name}!"
puts greeting # Output: Hello, Alice!
```

### 4. **C#**
In C#, you can use the `$` sign before the string:

```csharp
string name = "Alice";
string greeting = $"Hello, {name}!";
Console.WriteLine(greeting); // Output: Hello, Alice!
```

### 5. **PHP**
You can directly use variables within double-quoted strings:

```php
$name = "Alice";
$greeting = "Hello, $name!";
echo $greeting; // Output: Hello, Alice!
```

### 6. **Swift**
In Swift, you can use string interpolation with `\()`:

```swift
let name = "Alice"
let greeting = "Hello, \(name)!"
print(greeting) // Output: Hello, Alice!
```

### 7. **Go**
In Go, you can use `fmt.Sprintf` for similar functionality:

```go
package main

import (
"fmt"
)

func main() {
name := "Alice"
greeting := fmt.Sprintf("Hello, %s!", name)
fmt.Println(greeting) // Output: Hello, Alice!
}
```

Make sure to check the specific guidelines for string interpolation in the language you are using!