What is meant by Thermostat must be "Instantiated" in this specific challenge?

JavaScript
1

Tell us what’s happening:
The code that I wrote matches up with the same pattern used in the answer given but it is said that thermostat needs to be instantiated. I thought that a class was instantiated when it is made into an actual real object by the new keyword, but I cannot submit the answer.

So what is meant by the word “instantiated”?

Your code so far


/* Alter code below this line */
class Thermostat {
constructor(fahr){
this._fahr=fahr;
}

get temperature() {
return (5/9)*(this._fahr-52);
}
set temperature(num){
this.fahr=(num* 9.0) / 5 + 32;
}
}
/* Alter code above this line */

const thermos = new Thermostat(76); // setting in Fahrenheit scale
let temp = thermos.temperature; // 24.44 in C
thermos.temperature = 26;
temp = thermos.temperature; // 26 in C

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36.

Challenge: Use getters and setters to Control Access to an Object

Link to the challenge:
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/es6/use-getters-and-setters-to-control-access-to-an-object

2

i am also getting same same error even it is also printing the object also

3

typo here :slight_smile:

also,
there is also something missing on this line:
this.fahr=(num* 9.0) / 5 + 32;

4

i dont get it , where type ?

5

Double check the formula, it should be: 5/9 * (Fº - 32)

1 Like
6

i have also tried same but why it is saying thermostat should be intantiate as the constructor has been called and the object is also been created and when i displayed the object it is displaying but it is still showing same error

7

thank you for catching my typo, the code works now

1 Like
8

The object should be instantiated for you already with the new keyword, just make sure there are no syntax errors or typos in your original class function

9

That assert message is a bit misleading. If the instance does not return 0 when accessing temperature the assert will fail.

assert((() => {const t = new Thermostat(32);return typeof t === 'object' && t.temperature === 0;})());

It is not actually failing to instantiate.

const thermos = new Thermostat(32);
console.log(typeof thermos, thermos.temperature)
// should return 'object' 0
10

Indeed as per other commenters here, the instantiation-related error are misleading. The solution lies in making sure calculations are correct - enclosing the calculations in parentheses (PEMDAS principle) helped.