There is an array of objects with a 'value' field. How to create a new array containing only the numeric values from these objects (excluding strings)? How to do this and how to check if a value is a number?

To obtain a new array containing only the numeric values of the value field from an array of objects, you can use the filter and map methods in JavaScript.

You can check if a value is a number using the typeof function and by checking for NaN:

const arr = [
  { value: 10 },
  { value: '20' },
  { value: 30 },
  { value: 'abc' },
  { value: 40 }
];

const numbers = arr
  .map(obj => obj.value)
  .filter(val => typeof val === 'number' && !isNaN(val));

console.log(numbers); // [10, 30, 40]

Here:

• map extracts the value field from each object.
• filter keeps only those values that are of type number and are not NaN.

If you also want to consider numeric strings, you can use Number and check the result:

const numbers = arr
  .map(obj => Number(obj.value))
  .filter(val => !isNaN(val));

But since the question specifies without strings, the first option is suitable.