generic-order.js

var Object = require("./shim-object");

module.exports = GenericOrder;
function GenericOrder() {
    throw new Error("Can't construct. GenericOrder is a mixin.");
}

GenericOrder.prototype.equals = function (that, equals) {
    equals = equals || this.contentEquals || Object.equals;

    if (this === that) {
        return true;
    }
    if (!that) {
        return false;
    }

    var self = this;
    return (
        this.length === that.length &&
        this.zip(that).every(function (pair) {
            return equals(pair[0], pair[1]);
        })
    );
};

GenericOrder.prototype.compare = function (that, compare) {
    compare = compare || this.contentCompare || Object.compare;

    if (this === that) {
        return 0;
    }
    if (!that) {
        return 1;
    }

    var length = Math.min(this.length, that.length);
    var comparison = this.zip(that).reduce(function (comparison, pair, index) {
        if (comparison === 0) {
            if (index >= length) {
                return comparison;
            } else {
                return compare(pair[0], pair[1]);
            }
        } else {
            return comparison;
        }
    }, 0);
    if (comparison === 0) {
        return this.length - that.length;
    }
    return comparison;
};

GenericOrder.prototype.toJSON = function () {
    return this.toArray();
};