Simple map class

uber.js

//  Implement a key-value store with get(key), put(key, value), delete(key) operations.

class CustomMap {
    constructor() {
        this._keys = [];
        this._values = [];
    };
    
    put(key,value) {
      this._keys.push(key)
      this._values.push(value)  
    }
    
    _getPositionByKey (key) {
        const position = this._keys.indexOf(key)
        return position === -1 ? null : position
    }
    
    get(key) {
        const position = this._getPositionByKey(key)
        return this._values[position]
    }
    
    delete(key) {
        const position = this._getPositionByKey(key)
        delete this._keys[position]
        delete this._values[position]
    }
}


const map = new CustomMap()
map.put('kevin', 'uber')
map.put('nevil', 'uber2')
map.put('number', 124)
console.log(map.get('kevin'))
console.log(map.get('Null Test'))
console.log(map.get('nevil'))
console.log(map.get('number'))
map.delete("kevin")
console.log(map.get('nevil'))
console.log(map.get('kevin'))