Matt Crocco solution

js/script.js

@@ -12,21 +12,196 @@
  *       "Inspectah J"
  **/
 
+function isNil(value) {
+    return value === null || value === undefined;
+}
+
 function Generator() {
 
     /* Name Arrays: Customize names to change possible output */
-    this.last_names = ['the Chef', 'Digital', 'Wise', 'Knight', 'Wrecka', 'the Genius', 'the Zoo Keeper', 'the Monk', 'the Scientist', 'the Disciple', 'the Darkman', 'Pellegrino', 'the Ill Figure', 'Rocks The World', 'the Baptist',];
+    this.last_names = ['the Chef', 'Digital', 'Wise', 'Knight', 'Wrecka', 'the Genius', 'the Zoo Keeper', 'the Monk', 'the Scientist', 'the Disciple', 'the Darkman', 'Pellegrino', 'the Ill Figure', 'Rocks The World', 'the Baptist'];
     this.first_names = ['Inspectah', 'Masta', 'Poppa', 'Five Foot', 'Ghostface', 'Old Dirty'];
 
+    this._previousName = null;
+
+    const DEFAULT_OPTIONS = {
+        defaultValue: '',
+        chanceScale: 100,
+        chance: 50,
+        force: false,
+    };
+
+    this._pickFirstName = function(options) {
+        options = $.extend({}, DEFAULT_OPTIONS, options);
+
+        if (options.force || makeDiceRoll(options.chanceScale) <= options.chance)
+            return pickRandomElement(this.first_names);
+        else
+            return options.defaultValue;
+    };
+
+    this._pickMiddleName = function(name, options) {
+        options = $.extend({}, DEFAULT_OPTIONS, options);
+
+        if (options.force || makeDiceRoll(options.chanceScale) <= options.chance)
+            return asAcronym(name);
+        else
+            return capitalize(name);
+    };
+
+    this._pickLastName = function(options) {
+        options = $.extend({}, DEFAULT_OPTIONS, options);
+
+        if (options.force || makeDiceRoll(options.chanceScale) <= options.chance)
+            return pickRandomElement(this.last_names);
+        else
+            return options.defaultValue;
+    }
+
+    this.newRapName = function(weakName) {
+        /*
+            Dice Roll 1: Use First Name
+            Dice Roll 2: Acronymize (Only valid if Dice Roll 1 fails)
+            Dice Roll 3: Use Last Name
+         */
+
+        var firstName = this._pickFirstName({
+            chance: 60  // First names are pretty cool, make them slightly more likely
+        });
+
+        var middleName = this._pickMiddleName(weakName);
+        var lastName = this._pickLastName({
+            // We'll always have either a first name or a last name.
+            // Never will return just 'Jill' back.
+            force: firstName === ''
+        });
+
+        const rapName = fillTemplate('{first} {middle} {last}', {
+            first: firstName,
+            middle: middleName,
+            last: lastName,
+        }).trim();
+
+        if (rapName.split(' ').length === 1)
+            throw new Error(rapName);
+
+        // Ensure no repeats
+        if (rapName === this._previousName)
+            return this.newRapName(weakName);
+        else
+            return (this._previousName = rapName);
+    }
+
+}
+
+/**
+ * Returns an array of dice roll values going from 0 to maxValue-1 (they're weird dice). If the first argument is an
+ * array, it is assumed to be an array of max values for each dice roll.
+ *
+ * For example, given [20, 40, 10] you get back [a, b, c] where a, b and c are integers in the ranges [0, 19], [0, 39],
+ * and [0, 9] respectively.
+ *
+ * @param {number|Array<number>} count Either the number of die rolls or an array of max dice values
+ * @param {?number} maxValue Max possible value for each dice roll (only used when `count` is a number)
+ * @returns {Array<number>} All generated dice roll values
+ */
+function makeDiceRolls(count, maxValue) {
+    if (typeof count === 'number') {
+        const rolls = [];
+        for (var i = 0; i < count; i++)
+            rolls[i] = Math.floor(Math.random() * maxValue);
+        return rolls;
+    } else
+        return count.map(function (max) {
+           return Math.round(Math.random() * max);
+        });
+}
+
+/**
+ * Makes a single dice roll with the given max value. Calls `makeDiceRolls`.
+ *
+ * @param {number} maxValue Maximum possible dice roll value, exclusive.
+ * @returns {number} Dice roll value
+ */
+function makeDiceRoll(maxValue) {
+    return makeDiceRolls(1, maxValue)[0];
+}
+
+/**
+ * Selects a random element from the given array using a dice roll.
+ *
+ * @template T
+ * @param {Array<T>} arr Array to pick elements from
+ * @returns {T}
+ */
+function pickRandomElement(arr) {
+    return arr[makeDiceRolls(1, arr.length)[0]];
+}
+
+/**
+ * @param {string} word Word to capitalize
+ * @returns {string}
+ */
+function capitalize(word) {
+    return word[0].toUpperCase() + (word.length > 1 ? word.slice(1) : '')
+}
+
+/**
+ * Converts a given word to an acronymized version of itself.
+ *
+ * Example: 'Jill' -> 'J.I.L.L.'
+ *
+ * @param {string} word Word to acronymize
+ * @returns {string}
+ */
+function asAcronym(word) {
+    return word.toUpperCase().split('').join('.');
 }
 
+// A very dumb template filler
+function fillTemplate(formatString, options) {
+    const args = [].slice.call(arguments);
+    args.shift();
+    args.shift();
 
-//Add your codez here
+    return formatString.replace(/{\s*(\w*)\s*}/g, function (match, name){
+        if (name.length === 0)
+            if (args.length > 0)
+                return args.shift();
+            else
+                throw new Error('Insufficient position arguments');
+
+        if (isNil(options[name])) {
+            console.error(name, options);
+            return match;
+        }
+
+        return options[name];
+    });
+}
 
 
 $(document).ready(function() {
+    const input = $('input:text.form-control');
+    const messageBox = $('.messages');
+    messageBox.children().hide();
+
+    const successMessage = messageBox.find('.response');
+    const noInputError = messageBox.find('.error');
 
-    var engine = new Generator;
-    //Add your codez here
+    var engine = new Generator();
 
+    $('button#enter').click(function() {
+        const value = input.val().trim();
+        input.val(value);
+        if (value === '') {
+            noInputError.show();
+            successMessage.hide();
+        } else {
+            noInputError.hide();
+            var coolRapName = engine.newRapName(value);
+            successMessage.text(coolRapName);
+            successMessage.show();
+        }
+    });
 });