Which of these is a correct function declaration?

Question

BlackTom AI · Accepted Answer

In JavaScript, function declarations use the keyword function followed by the identifier, a parentheses pair for parameters, and a block for the body: function name(params) { /* body */ }.

1) Relevant knowledge points and concepts
- JavaScript function declaration syntax: function identifier([parameters]) { statements }
- Other forms: function expressions (e.g., const f = function() {}), arrow functions (=>), and language-specific keywords in other languages (e.g., Swift uses func).
- Reserved keywords: function is the correct keyword in JS; words like create are not JS keywords for declaring functions.

2) Step-by-step reasoning
- Examine option a: "func myFunc() {}"
  - The keyword func is not part of JavaScript syntax. It is used in Swift, not JS. Therefore as a JS function declaration this is invalid.
- Examine option b: "function myFunc() {}"
  - This matches JavaScript's function declaration form exactly: keyword function, a valid identifier myFunc, an empty parameter list (), and a block {}. This is syntactically correct in JS.
- Examine option c: "function = myFunc() {}"
  - This tries to assign with = but places function on the left; syntax is invalid. It mixes assignment and declaration incorrectly; also myFunc() would be a call, not a name. Not valid JS.
- Examine option d: "create function myFunc()"
  - There is no create keyword in JavaScript for making functions, and the body {} is missing. Invalid.

3) Calculations / intermediate steps
- Not applicable; reasoning is syntactic checking of each option against JS grammar.

4) Why the correct answer is correct
- Option b exactly follows the JavaScript grammar for a function declaration: keyword function, identifier, parameter parentheses, and function body braces.

5) Why other options are incorrect
- a: uses Swift keyword func, not JS.
- c: invalid syntax mixing assignment and call.
- d: uses nonexistent create keyword and omits function body.

Conclusion: The correct choice is b. This matches the provided answer "b. function myFunc() {}".

Which of these is a correct function declaration?单项选择题

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