To identify the Kotlin feature that allows for more compact function declarations by omitting curly braces and the return keyword for single-expression functions. The example clearly shows a functio

The question asks to identify the Kotlin feature that allows for more compact function declarations by omitting curly braces and the return keyword for single-expression functions. The example clearly shows a function fun sum(a: Int, b: Int): Int = a + b which uses an equals sign (=) to directly assign the result of an expression as the function's body.

This specific syntax is known as an expression body in Kotlin. It is used when a function's body consists of a single expression, making the code more concise.

Let's evaluate the options:

• Simplified Formatting: This is a general description, not the specific technical term.
• Expression Body Syntax: This is the correct technical term for functions whose bodies are a single expression, using the = operator.
• Compact Functionality: This is a general description, not a specific Kotlin feature name.
• Concise Structure: Similar to "Simplified Formatting" and "Compact Functionality", this is a general description.

The correct option is Expression Body Syntax.