When it comes to writing empty arrays in JavaScript, is there a difference between declaring them inside the method like this:
var example = {
calcMethod: function() {
this.array1 = [];
this.array2 = [];
}
};
and declaring them as object parameters like this?
var example = {
array1 : [],
array2 : []
};
Both approaches will allow you to eventually fill these arrays with data.
Despite the irregular JavaScript syntax, I will provide an answer to your question.
The main distinction lies in the fact that calcMethod needs to be invoked before array1 and array2 are defined in the initial code snippet. Otherwise, they will remain as undefined:
let object1 = {
calcMethod: function() {
this.array1 = [1];
this.array2 = [2];
}
}
let object2 = {
array1: [3],
array2: [4]
}
console.log(object1.array1);// undefined
console.log(object1.array2);// undefined
object1.calcMethod();
console.log(object1.array1);// [1]
console.log(object1.array2);// [2]
console.log(object2.array1);// [3]
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