kimhogeling/google_predictions.js

## google_predictions.js
/**
 * Created in Chrome. Uses `fetch` API and the high order functions `map` and `forEach`.
 * Module `googlePredictions` reveals two functions `fetchAndPrint` and `formattedPrint`.
 *   method `fetchAndPrint` needs an {Array} argument containing {string} search words.
 *     example: `googlePredictions.fetchAndPrint(['adidas', 'puma', 'nike', 'apple']);`
 *  method `formattedPrint` assumes `fetchAndPrint` was already called and needs no arguments.
 *    Example `googlePredictions.formattedPrint();`
 *      This is helpful in case one or more rows could not be fetched,
 *      and the automatic print at `fetchAndPrint` was not called.
 */
var googlePredictions = (function () {

    'use strict';

    /* PUBLIC METHODS */

    function fetchAndPrint(searchWords) {
        _searchWordsLength = searchWords.length;
        searchWords.forEach(_fetchPredictionsFromGoogle);
    }

    function formattedPrint() {
        var pretty = '';
        _endResult.sort();
        _endResult.forEach(function (row) {
            row.forEach(function (cell) {
                pretty += cell + '\t';
            });
            pretty += '\n';
        });
        console.log(pretty);
    }

    /* PRIVATE METHODS */

    function _fetchPredictionsFromGoogle(searchWord) {
        if (typeof searchWord !== 'string') {
            console.error('Given searchWord is not a string.', searchWord);
            _searchWordsLength--;
            return;
        }
        searchWord = encodeURIComponent(searchWord);
        fetch('https://www.google.de/complete/search?sclient=psy-ab&site=&source=hp&q=' + searchWord + '&oq=&gs_l=&pbx=1&bav=on.2,or.&bvm=bv.113370389,d.ZWU&fp=1&biw=731&bih=705&dpr=2&pf=p&gs_rn=64&gs_ri=psy-ab&tok=1e3TgYJYRkzLSXqNxu5N8g&cp=6&gs_id=r&xhr=t&tch=1&ech=8&psi=GyC5VvKECMSqPL_mpHA.1454972955852.1')
            .then(_checkStatusOfResponse)
            .then(_readTextFromResponse)
            .then(_extractRowFromResponseText)
            .then(_printIfDone)
            .catch(function (e) { console.error('Problem at "' + searchWord + '".', e) });
    }

    function _checkStatusOfResponse(r) {
        if (r.status < 200 && r.status >= 300) {
            return Promise.reject(new Error(r.statusText));
        }
        return Promise.resolve(r);
    }

    function _readTextFromResponse(r) {
        return r.text();
    }

    function _extractRowFromResponseText(rt) {
        try {
            var row = JSON.parse(JSON.parse(rt.replace('/*""*/', '')).d)[1].map(function(cell) {
                return cell[0].replace('<b>', '').replace('</b>', '');
            });
            _endResult.push(row);
        } catch (e) {
            return Promise.reject(new Error('Problem extracting row from Google\'s response. It might be missing in the end result below.'));
        }
    }

    function _printIfDone() {
        if (_searchWordsLength === _endResult.length) { formattedPrint() }
    }

    var _endResult = [], _searchWordsLength = 0;

    // Reveal public methods
    return {
        fetchAndPrint: fetchAndPrint,
        formattedPrint: formattedPrint
    };

}());

// Example:
googlePredictions.fetchAndPrint(['adidas', 'puma', 'nike', 'apple']);
	/**
	* Created in Chrome. Uses `fetch` API and the high order functions `map` and `forEach`.
	* Module `googlePredictions` reveals two functions `fetchAndPrint` and `formattedPrint`.
	* method `fetchAndPrint` needs an {Array} argument containing {string} search words.
	* example: `googlePredictions.fetchAndPrint(['adidas', 'puma', 'nike', 'apple']);`
	* method `formattedPrint` assumes `fetchAndPrint` was already called and needs no arguments.
	* Example `googlePredictions.formattedPrint();`
	* This is helpful in case one or more rows could not be fetched,
	* and the automatic print at `fetchAndPrint` was not called.
	*/
	var googlePredictions = (function () {

	'use strict';

	/* PUBLIC METHODS */

	function fetchAndPrint(searchWords) {
	_searchWordsLength = searchWords.length;
	searchWords.forEach(_fetchPredictionsFromGoogle);
	}

	function formattedPrint() {
	var pretty = '';
	_endResult.sort();
	_endResult.forEach(function (row) {
	row.forEach(function (cell) {
	pretty += cell + '\t';
	});
	pretty += '\n';
	});
	console.log(pretty);
	}

	/* PRIVATE METHODS */

	function _fetchPredictionsFromGoogle(searchWord) {
	if (typeof searchWord !== 'string') {
	console.error('Given searchWord is not a string.', searchWord);
	_searchWordsLength--;
	return;
	}
	searchWord = encodeURIComponent(searchWord);
	fetch('https://www.google.de/complete/search?sclient=psy-ab&site=&source=hp&q=' + searchWord + '&oq=&gs_l=&pbx=1&bav=on.2,or.&bvm=bv.113370389,d.ZWU&fp=1&biw=731&bih=705&dpr=2&pf=p&gs_rn=64&gs_ri=psy-ab&tok=1e3TgYJYRkzLSXqNxu5N8g&cp=6&gs_id=r&xhr=t&tch=1&ech=8&psi=GyC5VvKECMSqPL_mpHA.1454972955852.1')
	.then(_checkStatusOfResponse)
	.then(_readTextFromResponse)
	.then(_extractRowFromResponseText)
	.then(_printIfDone)
	.catch(function (e) { console.error('Problem at "' + searchWord + '".', e) });
	}

	function _checkStatusOfResponse(r) {
	if (r.status < 200 && r.status >= 300) {
	return Promise.reject(new Error(r.statusText));
	}
	return Promise.resolve(r);
	}

	function _readTextFromResponse(r) {
	return r.text();
	}

	function _extractRowFromResponseText(rt) {
	try {
	var row = JSON.parse(JSON.parse(rt.replace('/""/', '')).d)[1].map(function(cell) {
	return cell[0].replace('<b>', '').replace('</b>', '');
	});
	_endResult.push(row);
	} catch (e) {
	return Promise.reject(new Error('Problem extracting row from Google\'s response. It might be missing in the end result below.'));
	}
	}

	function _printIfDone() {
	if (_searchWordsLength === _endResult.length) { formattedPrint() }
	}

	var _endResult = [], _searchWordsLength = 0;

	// Reveal public methods
	return {
	fetchAndPrint: fetchAndPrint,
	formattedPrint: formattedPrint
	};

	}());

	// Example:
	googlePredictions.fetchAndPrint(['adidas', 'puma', 'nike', 'apple']);