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robinhickson
Front End Web Development Techdegree Graduate 18,162 PointsCan I create a collection of class instances using method inside Class template?
I'm attempting to track all instances of a Class by adding a method to the Class template, which would (should) push each instance to an array on creation... (I know I need to access ALL instances later).
const projectsCollection = [];
let Project = class {
constructor(projectname, genre,){
this.projectname= projectname;
this.genre= genre;
}
//Class collection
classCollection(){
return projectsCollection.push(this);
}
};
Seems so simple... yet it doesn't work! Any ideas to fix or alternatives to access all instances of a Class? Thank you Robin
2 Answers
Blake Larson
13,014 PointsThere are a couple ways you can do this. You just have to call that method on each instance of a new project.
const projectsCollection = [];
let Project = class {
constructor(projectname, genre){
this.projectname= projectname;
this.genre= genre;
}
//Class collection
classCollection(){
projectsCollection.push(this);
}
};
let p1 = new Project('song', 'country');
p1.classCollection();
let p2 = new Project('movie', 'comedy');
p2.classCollection();
console.log(projectsCollection); // Expects [Project, Project];
Or
const projectsCollection = [];
let Project = class {
constructor(projectname, genre){
this.projectname= projectname;
this.genre= genre;
}
};
let p1 = new Project('song', 'country');
projectsCollection.push(p1);
let p2 = new Project('movie', 'comedy');
projectsCollection.push(p2);
console.log(projectsCollection); // Expects [Project, Project];
Automatically on creation called in constructor
let projectsCollection = [];
let Project = class {
constructor(project, genre) {
this.project = project;
this.genre = genre;
this.pushProject = function() {
projectsCollection.push(this);
}
this.pushProject();
}
}
let p1 = new Project('song', 'country');
let p2 = new Project('movie', 'comedy');
console.log(projectsCollection); // Expects [Project, Project];
robinhickson
Front End Web Development Techdegree Graduate 18,162 PointsAhh. I like the last solution - the other two I had (finally) got working already. But the last solution is neat and tidy. Thank you!
Robin