JavaScript for Complete Beginners Code Examples

var text = 
    'And this is Dorlcote Mill. I must '
  + 'stand a minute or two here on the bridge '
  + 'and look at it, though the clouds are '
  + 'threatening, and it is far on in the afternoon. '
  + 'Even in this leafless time of departing February '
  + 'it is pleasant to look at,–perhaps the chill, '
  + 'damp season adds a charm to the trimly kept, '
  + 'comfortable dwelling-house, as old as the elms '
  + 'and chestnuts that shelter it from the '
  + 'northern blast. ';
  
var text_analyzer = {
    current_text : text,
    get_words_array : function() {
        var text = this.current_text;
        var split_text = text.split(' ');
        return split_text;
    },
    count_words : function() {
        var words_array = this.get_words_array();
        var length = words_array.length;
        return length;
    },
    get_average_word_length : function() {
      var all_word_lengths = 0;
      var words_array = this.get_words_array();
      for(var i in words_array) {
          var current_word = words_array[i];
          all_word_lengths = all_word_lengths +
              current_word.length;
      }
      return all_word_lengths / words_array.length;
    },
    get_longest_word : function() {
        var longest_length_seen_so_far = 0;
        var longest_word = '';
        var words_array = this.get_words_array();
        for(var i in words_array) {
            var current_word = words_array[i];
            if(current_word.length > 
                longest_length_seen_so_far) {
                longest_word = current_word;
                longest_length_seen_so_far =
                    current_word.length;
            }
        }
        return longest_word;
    },
    get_word_frequencies : function() {
        var words_array = this.get_words_array();
        var word_frequencies = {};
        for(var i in words_array) {
            var current_word = words_array[i];
            if(! (current_word in word_frequencies)) {
                word_frequencies[current_word] = 1;
            }
            else {
                var previous_frequency = 
                    word_frequencies[current_word];
                var new_frequency = previous_frequency
                    + 1;
                word_frequencies[current_word] =
                    new_frequency;
            }
        }
        return word_frequencies;
    },
};

function print_object(the_object) {
    document.write('{
');
    for(var i in the_object) {
        var key = i;
        var value = the_object[i];
        document.write('"' + key + '"');
        document.write(' : ');
        if(Array.isArray(value)) {
            print_array(value);   
        }
        else if(typeof value === 'object') {
            print_object(value);
        }
        else {
            document.write(value);
        }
        document.write('
');
    }
    document.write('}
');
}
function print_array(the_array) {
    document.write('[
');
    for(var i in the_array) {
        var value = the_array[i];
        if(Array.isArray(value)) {
            print_array(value);
        }
        else if(typeof value === 'object') {
            print_object(value);
        }
        else {
            document.write(value + ',');
        }
    }
    document.write(']
');
}

document.write(text_analyzer.get_word_frequencies()['on']);

Chapter 12 “Program” starting code:

 
 
 
 
 
 

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Chapter 12 four rectangles example. Remove the lines that say “remove this line” otherwise the code will not work.

    Rectangle 1


    Rectangle 2


    Rectangle 3


    Rectangle 4

Chapter 13 cookie-related code:

Who that cares much to know the history of man, and how the 
    mysterious mixture behaves under the varying experiments of Time,
    has not dwelt, at least briefly, on the life of Saint Theresa, 
    has not smiled with some gentleness at the thought of the little 
    girl walking forth one morning hand-in-hand with her still 
    smaller brother, to go and seek martyrdom in the country of
    the Moors?

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