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Viewing file:     pairwise.js (1.51 KB)      -rwxrwxr-x

"use strict";
var pairwise_1 = require('../operators/pairwise');
/**
 * Groups pairs of consecutive emissions together and emits them as an array of
 * two values.
 *
 * <span class="informal">Puts the current value and previous value together as
 * an array, and emits that.</span>
 *
 * <img src="./img/pairwise.png" width="100%">
 *
 * The Nth emission from the source Observable will cause the output Observable
 * to emit an array [(N-1)th, Nth] of the previous and the current value, as a
 * pair. For this reason, `pairwise` emits on the second and subsequent
 * emissions from the source Observable, but not on the first emission, because
 * there is no previous value in that case.
 *
 * @example <caption>On every click (starting from the second), emit the relative distance to the previous click</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var pairs = clicks.pairwise();
 * var distance = pairs.map(pair => {
 *   var x0 = pair[0].clientX;
 *   var y0 = pair[0].clientY;
 *   var x1 = pair[1].clientX;
 *   var y1 = pair[1].clientY;
 *   return Math.sqrt(Math.pow(x0 - x1, 2) + Math.pow(y0 - y1, 2));
 * });
 * distance.subscribe(x => console.log(x));
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 *
 * @return {Observable<Array<T>>} An Observable of pairs (as arrays) of
 * consecutive values from the source Observable.
 * @method pairwise
 * @owner Observable
 */
function pairwise() {
    return pairwise_1.pairwise()(this);
}
exports.pairwise = pairwise;
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