average.md

This is RxJS v 4. Find the latest version here

Rx.Observable.prototype.average([selector], [thisArg])

Ⓢ

Computes the average of an observable sequence of values that are in the sequence or obtained by invoking a transform function on each element of the input sequence if present.

Arguments

1. [selector] (Function): A transform function to apply to each element.
2. [thisArg] (Any): Object to use as this when executing selector.

Returns

(Observable): An observable sequence containing a single element with the average of the sequence of values.

Example

// Without a selector
var source = Rx.Observable.range(0, 9).average();

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

// => Next: 4
// => Completed

// With a selector
var arr = [
    { value: 1 },
    { value: 2 },
    { value: 3 }
];

var source = Rx.Observable.from(arr).average(function (x) {
    return x.value;
});

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

// => Next: 2
// => Completed

Location

File:

• /src/core/linq/observable/average.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/average.js