helpers.js

// Lifted directly from MDN
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat
var repeat = function(string, count) {
    'use strict';
    if (string == null) {
        throw new TypeError('can\'t convert ' + string + ' to object');
    }
    var str = '' + string;
    count = +count;
    if (count != count) {
        count = 0;
    }
    if (count < 0) {
        throw new RangeError('repeat count must be non-negative');
    }
    if (count == Infinity) {
        throw new RangeError('repeat count must be less than infinity');
    }
    count = Math.floor(count);
    if (str.length == 0 || count == 0) {
        return '';
    }
    // Ensuring count is a 31-bit integer allows us to heavily optimize the
    // main part. But anyway, most current (august 2014) browsers can't handle
    // strings 1 << 28 chars or longer, so:
    if (str.length * count >= 1 << 28) {
        throw new RangeError('repeat count must not overflow maximum string size');
    }
    var rpt = '';
    for (;;) {
        if ((count & 1) == 1) {
            rpt += str;
        }
        count >>>= 1;
        if (count == 0) {
            break;
        }
        str += str;
    }
    return rpt;
};

var pretty = function(prog, indent) {
    return JSON.stringify(prog, function(key, value) {
        if (_.isFunction(value)) {
            var name = value.name || "(anonymous)";
            return "function " + name;
        }
        return value;
    }, 2);
};

var log = function() {
    console.log(">>> " + Array.prototype.slice.call(arguments).map(pretty).join("\n"));
};

module.exports = {
    repeat: repeat,
    pretty: pretty,
    log: log
};