0
How can I access parameters received from a class outside its scope, as in the function below. Or is there another better way to do this?
helper.js
class Helper {
constructor(user) {
this.user = user;
}
}
rebeceUser function () {
// recebe user
}
game js.
new Helper("João");
0
Put input parameters as function argument, for example:
class Helper {
constructor(user) {
this.user = user;
}
}
rebeceUser function (variavelQualquer) {
console.log(variavelQualquer);
// recebe user
}
When you call the class method, just put a variable or constant as a parameter between the parentheses of the method
user = "João"
helper = new Helper(user);
helper.recebeUser(user);
But analyzing the method name, I think you want to "welcome" the user of the helper class, for this you do not need a parameter in the function, but just call the attribute that received value in the constructor, would look like this:
class Helper {
constructor(user) {
this.user = user;
}
}
rebeceUser function () {
console.log("Bem Vindo " + this.user);
}
-
user = "João"
helper = new Helper(user);
helper.recebeUser();
//Será impresso no console "Bem Vindo João"
(ah, and if they are in different files, you will need to reference each other, in this case the helper.js within the game.js)
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I hope I have understood your question. There goes:
After instantiating the Helper class, just use .user to access the property.
class Helper {
constructor(user) {
this.user = user;
}
}
var helper = new Helper('João');
console.log(helper.user); // João
If you want the function:
class Helper {
constructor(user) {
this.user = user;
}
}
function recebeUser(objetoHelper) {
return objetoHelper.user;
}
var helper = new Helper('Maria');
console.log( recebeUser(helper) ); // Maria
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Returns "Welcome Undefined", as it is in different files, I’m referencing the helper in the game. Still it doesn’t work.
– Charles Fonseca
If you can access the class method within game.js, then an instance of the class is inside, as the class is instantiating?
– motorola
class helper { constructor(user) { this.user = user; } } Function rebeceUser() { console.log("Welcome " + this.user); } module.Exports = Helper; game.js: Let helper = require('. /helper'); new helper("John");
– Charles Fonseca
Remember that new returns the reference, if it is not assigning new to anywhere, the reference is empty, and the user object used in the constructor is lost
– motorola
then I pass to the return function?
– Charles Fonseca
You pass the object reference to a variable, and access the class methods through this variable: "Variable Let = new Helper("John") ", -- " variable.receivedUser() "
– motorola