[using for loop to add prooperty]Add Key-Value Pairs to JavaScript Objects

JavaScript
1

Tell us what’s happening:

i solved the challenge manually by adding property and value then i tried using below code it only works partially. The output is {"apples":25,"oranges":32,"plums":28,"bananas":27,"grapes":27,"strawberries":27} all the newly added properties(bananas,grapes,strawb) has the same value

Your code so far


let foods = {
  apples: 25,
  oranges: 32,
  plums: 28
};

// change code below this line
let arr=['bananas','grapes','strawberries'];
let val=[13,35,27];
for(let i=0;i<arr.length;i++){
  for(let j=0;j<val.length;++j){foods[arr[i]]=val[j];}
}
/*foods.bananas=13;
  foods.grapes=35;
  foods.strawberries=27;*/
  //foods.bab
// change code above this line

console.log(JSON.stringify(foods));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-data-structures/add-key-value-pairs-to-javascript-objects

2

why do you have an inner loop ?

3

to add values to the property.

4

right but you can access the corresponding values with just your outer loop, since the values are in order and of the same length

5

Thank you using single loop fixed it. :smile: )

6

but what if we have to select values from a larger array?

7

It doesn’t matter as long as the property array order and length matches with value array order and length

1 Like
8

I understand thank you :slight_smile:

9

you don’t need the inner loop , because the first loop you have can give you the result you need ,
just inject this code
foods[arr[i]]=val[i];
every time i increments you can get new property name from arr and new property value from val .