`Rx.Observable.prototype.every(predicate, [thisArg])`

Determines whether all elements of an observable sequence satisfy a condition.

Arguments

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

Returns

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

Example

var source = Rx.Observable.of(1,2,3,4,5)
  .every(function (x) {
    return x < 6;
  });

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