some.md

Rx.Observable.prototype.some([predicate], [thisArg])

Ⓢ

Determines whether any element of an observable sequence satisfies a condition if present, else if any items are in the sequence. There is an alias to this function called some.

Arguments

1. [predicate] (Function): A function to test each element for a condition.
2. [thisArg] (Any): Object to use as this when executing callback.

Returns

(Observable): An observable sequence containing a single element determining whether one of the elements in the source sequence pass the test in the specified predicate.

Example

// Without a predicate
var source = Rx.Observable.empty().some();

var subscription = source.subscribe(
  function (x) {
    console.log('Next: %s', x);
  },
  function (err) {
    console.log('Error: %s', err);
  },
  function () {
    console.log('Completed');
  });

// => Next: false
// => Completed

// With a predicate
var source = Rx.Observable.of(1,2,3,4,5)
  .some(function (x) { return x % 2 === 0; });

var subscription = source.subscribe(
  function (x) {
    console.log('Next: %s', x);
  },
  function (err) {
    console.log('Error: %s', err);
  },
  function () {
    console.log('Completed');
  });

// => Next: true
// => Completed

Location

File:

• /src/core/linq/observable/some.js

Dist:

• rx.all.js
• rx.all.compat.js
• rx.aggregates.js

Prerequisites:

• rx.js | rx.compat.js | rx.lite.js | rx.lite.compat.js

NPM Packages:

• rx

NuGet Packages:

• RxJS-All
• RxJS-Aggregates

Unit Tests:

• /tests/observable/some.js