ExistenceDictionary

ExistenceDictionary.js

class ExistenceDictionary {
    constructor(valsToAdd = []) {
        this.store = {};
        
        valsToAdd.forEach((val) => {
            this.store[val] = true;
        })
    }
    
    exists(val) {
        return this.store[val] === true;
    }
    
    add(val) {
        this.store[val] = true;
    }
    remove(val) {
        this.store[val] = undefined;
    }
}