squad/legacy/squad.js

right-to-left function composition

'use strict';

var compose = [function () {
    return function () {};
}, function (f) {
    return function () {
        return f.apply(undefined, arguments);
    };
}, function (f1, f2) {
    return function () {
        return f1(f2.apply(undefined, arguments));
    };
}, function (f1, f2, f3) {
    return function () {
        return f1(f2(f3.apply(undefined, arguments)));
    };
}, function (f1, f2, f3, f4) {
    return function () {
        return f1(f2(f3(f4.apply(undefined, arguments))));
    };
}, function (f1, f2, f3, f4, f5) {
    return function () {
        return f1(f2(f3(f4(f5.apply(undefined, arguments)))));
    };
}, function (f1, f2, f3, f4, f5, f6) {
    return function () {
        return f1(f2(f3(f4(f5(f6.apply(undefined, arguments))))));
    };
}, function (f1, f2, f3, f4, f5, f6, f7) {
    return function () {
        return f1(f2(f3(f4(f5(f6(f7.apply(undefined, arguments)))))));
    };
}];

module.exports = function () {
    for (var _len = arguments.length, fns = Array(_len), _key = 0; _key < _len; _key++) {
        fns[_key] = arguments[_key];
    }

    if (fns.length < compose.length) return compose[fns.length].apply(compose, fns);

    return bigCompose(fns);
};

function bigCompose(fns) {
    return function () {
        var i = fns.length - 1;
        var value = fns[i].apply(fns, arguments);

        while (--i) {
            value = fns[i](value);
        }return value;
    };
}