4
Is there any difference between:
module.exports = (function() {
// Code.
})();
And:
module.exports = function() {
// Code.
};
Taking into account the context of exporting and importing modules?
1 answer
2
Nothing changes in the "module import and export context". What will really change, between the two examples, is the value which will be exported.
In the first example:
module.exports = (function() {
// Code.
})();
See that we have a IIFE, which means that it will be executed soon after your declaration. Thus, the value exported by module.exports will be the value that is returned by it. Thus:
module.exports = (function() {
return 'Luiz Felipe';
})();
The module in question would export the value 'Luiz Felipe', and not a function.
However, most of the time, this is completely unnecessary, since the scope of the modules is private to other files, so there is really no need to export an IIFE-wrapped value to Node.js.
In the other case:
module.exports = function() {
// Code.
};
The module would export the function itself, not the value returned by it. To get your return, you would need to run it after importing it, using the require.
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The
()after the function means that it will be executed immediately after your declaration.– Sam
This creates some difference in the context of exporting and importing modules?
– Luiz Felipe
In that context I can’t explain. :(
– Sam
See if this helps: https://answall.com/questions/13364/70
– Bacco
No. I already know that. I just want to know if there is any difference between the two in the context of modules (export and import), as said in the above comment... :/
– Luiz Felipe