CodeStepByStep

This problem with work with a JSON-formatted object representing a "party" (collection) of Pokemon objects with the following schema:

{ "party" : [
    { "name" : String, "nickname" : String, "type" : String[], "weakness" : String[], "level" : Number },
    { "name" : String, "nickname" : String, "type" : String[], "weakness" : String[], "level" : Number },
        ...
]}

Each party (an array corresponding to the "party" key) contains Pokemon objects, each with a name (string), nickname (string), type (string array), weakness (string array), and level (Number). The type and weakness arrays represent the (possibly-multiple) "type" elements and "weakness" elements of the Pokemon. While not needed to solve this problem, a Pokemon's type determines whether it is strong against another Pokemon with a weakness for that first Pokemon's type. The level represents how many "experience points" the Pokemon has accumulated and is in a range from 1 to 100 (inclusive).

Write a function named avgLevel that takes as a parameter a JavaScript object representing a party of Pokemon as defined, and returns the average level for all Pokemon in the party array.

For example, if the following object is defined:

let myParty = { "party" : [
    { 
        "name" : "Pikachu",
        "nickname" : "Sparky",
        "type" : ["electric"],
        "weakness" : ["ground"],
        "level" : 30
    },
    { 
        "name" : "Squirtle",
        "nickname" : "Bubbles",
        "type" : ["water"],
        "weakness" : ["electic", "grass"],
        "level" : 14
    },
    { 
        "name" : "Caterpie",
        "nickname" : "Wiggles",
        "type" : ["bug"],
        "weakness" : ["fire"],
        "level" : 1 
    },
    { 
        "name" : "Charizard",
        "nickname" : "Drogon",
        "type" : ["water"],
        "weakness" : ["electic", "grass"],
        "level" : 100
    }
]}

then the call avgLevel(myParty) should return the value 36.25 since that is the average of the levels for the party of 4 Pokemon. If any Pokemon objects have a level value that is less than 1 or greater than 100, your function should throw an exception with the message, "All objects in party array must have level between 1 and 100 (inclusive)".

You may assume that the passed object is non-null but if the "party" key is missing or has an empty array as its value, your function should throw an exception with the message: "Passed object must have 'party' key with non-empty array value".

You may assume all of the keys of each Pokemon object in the "party" array are defined and have the datatype specified in the provided schema.