compary/lib/Comparator.js

A library for composing complex compare-functions

Object.defineProperty(exports, "__esModule", { value: true });
var naturalOrder = function (a, b) { return a < b ? -1 : a > b ? 1 : 0; };
function compare(comparison) {
    return Object.assign(comparison, {
        reversed: function () {
            return compare(function (a, b) { return comparison(a, b) * -1; });
        },
        then: function (nextComparison) {
            return compare(function (a, b) {
                var result = comparison(a, b);
                return result !== 0
                    ? result
                    : nextComparison(a, b);
            });
        },
        thenDescending: function (nextComparison) {
            return this.then(compare(nextComparison)
                .reversed());
        },
        thenBy: function (selector) {
            return this.then(function (a, b) { return naturalOrder(selector(a), selector(b)); });
        },
        thenByDescending: function (selector) {
            return this.then(compare(function (a, b) { return naturalOrder(selector(a), selector(b)); })
                .reversed());
        }
    });
}
exports.compare = compare;
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