String Templates

fun main() {
    val name = "Kotlin"
    val version = 2
    println("Language: $name, Version: $version")
}

fun main() {
    val a = 5
    val b = 3
    println("Sum: ${a + b}, Product: ${a * b}")
}

data class Point(val x: Int, val y: Int)

fun main() {
    val p = Point(3, 4)
    println("Point is at (${p.x}, ${p.y})")
}

fun main() {
    val price = 20
    println("Price: \$$price")
}

1. Forgetting the curly braces around an expression more complex than a single variable, like $user.name instead of ${user.name}.
2. Trying to use string concatenation with + everywhere out of habit instead of the more readable $variable syntax.
3. Forgetting to escape a literal dollar sign with \$ when it should not start a template.

• $variableName inside a string inserts that variable's value directly.
• ${expression} with curly braces is required for anything beyond a simple variable name, such as a property access or a calculation.
• A literal dollar sign in a string must be escaped as \$ to avoid being treated as a template.
• String templates work inside both single-line and triple-quoted strings.