Object.prototype,map

[luo29]

`
Object.prototype.map = function(callback){
if(typeof callback !== "function"){
throw new TypeError("param must be a Function")
}
const newObj = {}
for(const key in this){
if(this.hasOwnProperty(key)){
newObj[key] = callback(this[key],key,this)
}
}
return newObj
}

`