Filtering object values in Typescript based on specific keys

Here is a JSON object:

{ "A": " ", "B": "x", "C": " " }

I am trying to extract specific values in array form like this:

["A", "C"]

This array represents the keys from the original JSON object that do not have the value "x".

During a REST subscription, I encounter the following scenario:

...
.subscribe(
(data: Map<string, string>)=>{
   Object.entries(data).filter((item: string[]) => item[1] !== 'x')
}
...
);

However, this code results in a multidimensional array:

[['A', ' '],['C', ' ']]

I am struggling to properly reduce this multidimensional array and achieve my desired output.

Answer №1

To obtain the key of each entry following the filtering process, you can utilize a map function.

const data = { "A": " ", "B": "x", "C": " " };
const filteredKeys = Object.entries(data)
  .filter(item => item[1] !== 'x')
  .map(item => item[0]);
console.log(filteredKeys);

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