multitude
Version:
Comprehensive streams for push and pull
32 lines (25 loc) • 2.87 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.compare = compare;
var _operate = require("../../utils/operate");
var _typeCore = require("type-core");
var _equalStrategies = require("equal-strategies");
/** @ignore */
const $empty = Symbol('empty');
function compare(strategy) {
const fn = !strategy || _typeCore.TypeGuard.isString(strategy) ? _equalStrategies.compare.bind(null, strategy || 'strict') : strategy;
return (0, _operate.operate)(obs => {
let last = $empty;
return {
next(value) {
if (last === $empty || !fn(value, last)) {
last = value;
return obs.next(value);
}
}
};
});
}
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