我应该更喜欢函数而不是javascript中的变量吗？

Question

I saw in particular project this syntax used all the time:

function a() {
    return 'hello';
}
function b() {
    return `${a()} world`;
}
b();

and all variables were almost omitted. Why just don't use syntax below?

const a = `hello`;
const b = `${a} world`;
console.log(b);

What advantage has function used to return string compare to const, because I don't see any practical one. Only what comes to mine mind is that const b is executed all the time compare to function b which executed only when called. Am I missing something?

Answer 1

If the purpose is to provide API path the function approach provide more flexibility.

IE:

You can switch environment (test/staging/prod) based on conditions (IE dotENV data). This is useful when managing base url of your API

function getENV() {
  switch (process.env.NODE_ENV) {
    case 'production': {
      return URL_PROD;
    }
    case 'staging': {
      return URL_STAGING;
    }
    case 'test': {
      return URL_TEST;
    }
    default: {
      return DEFAULT_URL;
    }
}

Another function can mix the default baseURL with your variable-stored endpoints

IE:

function getEndpointURL(endpoint) {
    return `${getENV()}/${endpoint}`
}