axax/esnext/distinctUntilChanged.js

A library of async iterator extensions for JavaScript including ```map```, ```reduce```, ```filter```, ```flatMap```, ```pipe``` and [more](https://github.com/jamiemccrindle/axax/blob/master/docs/API.md#functions).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Only emit when the current value is different than the last.
 */
function distinctUntilChanged() {
    return async function* inner(source) {
        let previousItem;
        for await (const item of source) {
            if (previousItem !== item) {
                yield item;
            }
            previousItem = item;
        }
    };
}
exports.distinctUntilChanged = distinctUntilChanged;