How to iterate over the following array of objects inside another object in Javascript?

Question

These are the objects and a simple function:

const getTotalYield = plants => {
    console.log(plants);
}

const corn = {
    name: "corn",
    yield: 3,
};
const pumpkin = {
    name: "pumpkin",
    yield: 4,
};
const crops = [
    { crop: corn, numCrops: 5 },
    { crop: pumpkin, numCrops: 2 },
];

I have to call it like this:

getTotalYield({crops})

output so far:
{
  crops: [ { crop: [Object], numCrops: 5 }, { crop: [Object], numCrops: 2 } ]
}

So how do I access the first object and then work with the properties in the array?

root · Accepted Answer · 2022-08-13 10:22:47Z

1

You can access your fields inside the object like this.
This snipet multiples the num of crops by the yields of each crop and them add it to the total yields.

const getTotalYield = plants => {
  let totalY =0;
  plants.forEach(function(element){
    totalY += (element.crop.yield)*element.numCrops;
  });
  console.log(totalY);
}

const corn = {
    name: "corn",
    yield: 3,
};
const pumpkin = {
    name: "pumpkin",
    yield: 4,
};
const crops = [
    { crop: corn, numCrops: 5 },
    { crop: pumpkin, numCrops: 2 },
];

getTotalYield(crops);

answered Aug 13, 2022 at 10:22

root

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4 Comments

Arjan van der Laan Over a year ago

Oke thank you! I have to work with calling the function like this, with the curly braces: getTotalYield({crops}) Then I get a typeError: plants.forEach is not a function. How would I go about calling the function like that?

root Over a year ago

what framework or library are you working with to solve the {crops} with curly braces into data?

Arjan van der Laan Over a year ago

I am using the testing library Jest

root Over a year ago

" typeError: plants.forEach is not a function " means whatever data " {crops} " return is not an array, it may have a wraper of some sort, i don't know anything about jest. Try to console.log({crops}) to see what kind of object it is.

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