add key value pairs to object from an array - Javascript

Question

How can I automate the process of assigning the key to an object from an array and the value to contain the same element as a string?

I have an empty object and an array:

const myObject= {};

const newsCategory = ['business', 'entertainment', 'general', 'health', 'science'];

I need to populate the object with key-value pairs.

The key should be each element from the newsCategory array.

The value should be an instance of another object.

new GetNews({country: 'gb', category: newsCategory[element]});

I can do this the manual way, assigning each category individually:

myObject.business = new GetNews({country: 'gb', category: newsCategory ['business']});

...and the same to the rest of the categories.

The result would be

{
    business: GetNews {
                category: "business"
                country: "gb"
                }
    entertainment: GetNews {
                category: "entertainment"
                country: "gb"
                }
    general: GetNews {
                category: "general"
                country: "gb"
                }
    health: GetNews {
                category: "health"
                country: "gb"
                }
    science: GetNews {
                category: "science"
                country: "gb"
                }
    
}

I need to do this process automatically, with a loop for example.

This is my attempt but it's not working.

newsCategory.forEach((category) => {
        let cat = String.raw`${category}`; //to get the raw string
         myObj.cat = new GetNews({country: 'gb', category: category});
    })
};

/*
output: 

{cat: "undefined[object Object][object Object][object Obj…ect][object Object][object Object][object Object]"}
*/

How can I automate the process of assigning the key to an object from an array and the value to contain the same element as a string?

Pedro A · Accepted Answer · 2018-11-23 12:41:48Z

4

Instead of myObj.cat you should do myObj[cat] so that cat is evaluated as the key value, otherwise you're setting a key named "cat".

Also String.raw is weird, don't use that. Your categories are strings already.

newsCategory.forEach((category) => {
        myObj[category] = new GetNews({country: 'gb', category: category});
    })
};

answered Nov 23, 2018 at 12:41

Pedro A

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1 Comment

Lenny86 Over a year ago

thanks for pointing out my mistake, your solution worked well.

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