Surveys / State of JavaScript 2022
This survey closed on December 1, 2022. View Survey Results »

1/14Language

  1. Proxies
  2. Promise.allSettled()
  3. Dynamic Import
  4. Nullish Coalescing
  5. Private Fields
  6. Numeric Separators
  7. string.replaceAll()
  8. string.matchAll()
  9. Logical Assignment
  10. Promise.any()
  11. array.at()
  12. Top-level await
  13. Temporal
  14. array.findLast()
  15. error.cause
  16. Object.hasOwn()
  17. Regexp Match Indices
Welcome to the survey! This first part is all about figuring out which features of the JavaScript language you've used before.

Returns a single Promise that fulfills when all of the input's promises fulfills.

js 
const promises = [promise1, promise2];

Promise.allSettled(promises).then((results) =>
  results.forEach((result) => console.log(result.status)),
);

Load a module asynchronously and dynamically.

js 
await import('/modules/my-module.js')

Return first value, or second value if first value is null or undefined.

js 
const foo = null ?? 'default string';
console.log(foo);
// expected output: "default string"

const baz = 0 ?? 42;
console.log(baz);
// expected output: 0

Properties that cannot be legally referenced outside of the class.

js 
class ClassWithPrivateField {
  #privateField
}

Replace all instances of a string.

js 
const s1 = "foo_bar_baz";
const s2 = s1.replaceAll('_', '-');

Return an iterator of all results matching this string against a regular expression.

js 
const regexp = /t(e)(st(\d?))/g;
const str = 'test1test2';
const array = [...str.matchAll(regexp)];

Operators to assign a value to a variable based on its own truthy/falsy status.

js 
const a = { duration: 50, title: '' };

a.duration ||= 10;
console.log(a.duration);
// expected output: 50

a.title ||= 'title is empty.';
console.log(a.title);
// expected output: "title is empty"

Returns a single Promise that fulfills when any of the input's promises fulfills.

js 
const promises = [promise1, promise2, promise3];

Promise.any(promises).then((value) => console.log(value));

Provides standard objects and functions for working with dates and times.

Returns the value of the last element that satisfies the testing function.

js 
const array1 = [5, 12, 50, 130, 44];
const found = array1.findLast((element) => element > 45);
console.log(found);
// expected output: 130

Indicate the specific original cause of the error.

js 
try {
  connectToDatabase();
} catch (err) {
  throw new Error('Connecting to database failed.', { cause: err });
}

js 
const object1 = {
  prop: 'exists'
};
console.log(Object.hasOwn(object1, 'prop'));
// expected output: true

Store the start and end positions of each matched capture group.

js 
const str1 = "foo bar foo";
const regex1 = /foo/dg;
console.log(regex1.exec(str1).indices[0]); // Output: Array [0, 2]
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