into.js

const {
    transduce,
    completing
} = require("./transducers.js");

const INJEST_METHOD = "@@com.boogie666.tranducers.util/injest";

function injest_method(o) {
    return o[INJEST_METHOD];
}

function can_injest(o) {
    return !!injest_method(o);
}

function injest(xs, item) {
    if (can_injest(xs)) {
        return injest_method(xs).call(xs, item);
    }
    throw xs + " can't injest " + item;
}

function add_injest_method(proto, fn) {
    proto[INJEST_METHOD] = fn;
}


function into(to, xform, from) {
    return transduce(xform, completing(injest), to, from);
}


module.exports = {
    into: into,
    injest: injest,
    addInjestMethod: add_injest_method
};