feat: add solutions

src/carbon-dating.js

@@ -1,22 +1,22 @@
-const MODERN_ACTIVITY= 15; 
-const HALF_LIFE_PERIOD= 5730;
+const MODERN_ACTIVITY = 15;
+const HALF_LIFE_PERIOD = 5730;
 
 const CONSOLE_LOG_ENABLE = false;
 
 module.exports = function dateSample(string_data/* sampleActivity */) {
   // throw 'Not implemented';
-   if (CONSOLE_LOG_ENABLE) console.log(string_data);
+  if (CONSOLE_LOG_ENABLE) console.log(string_data);
   if (!((typeof string_data) === "string")) {
     return false;
   }
 
-  let num =  parseFloat(string_data);
-   if (CONSOLE_LOG_ENABLE) console.log(num); 
-  if (!((num < MODERN_ACTIVITY) && (num>0))) {
+  let num = parseFloat(string_data);
+  if (CONSOLE_LOG_ENABLE) console.log(num);
+  if (!((num < MODERN_ACTIVITY) && (num > 0))) {
     return false;
   }
 
-  let age = Math.ceil(5730*Math.log(MODERN_ACTIVITY/num)/0.693);
-   if (CONSOLE_LOG_ENABLE) console.log(age); 
+  let age = Math.ceil(HALF_LIFE_PERIOD * Math.log(MODERN_ACTIVITY / num) / 0.693);
+  if (CONSOLE_LOG_ENABLE) console.log(age);
   return age;
 };

src/extended-repeater.js

@@ -1,5 +1,31 @@
-module.exports = function repeater(/* str, options */) {
+module.exports = function repeater(str, options) {
+
+
+    repeatTimes = 'repeatTimes' in options ? options.repeatTimes : 0;
+    separator = 'separator' in options ? options.separator : '+';
+    addition = 'addition' in options ? options.addition : '';
+    additionRepeatTimes = 'additionRepeatTimes' in options ? options.additionRepeatTimes : 0;
+    additionSeparator = 'additionSeparator' in options ? options.additionSeparator : '|';
+
+    outstring = '';
+    let i = 0;
+    do {
+        i++;
+        if (i > 1) {
+            outstring = outstring + separator;
+        }
+        let add_str = '';
+        let j = 0;
+        do {
+            j++;
+            if (j > 1) {
+                add_str = add_str + additionSeparator;
+            }
+            add_str = add_str + addition
+        } while (j < additionRepeatTimes);
+        outstring = outstring + str + add_str;
+    } while (i < repeatTimes);
+    return outstring;
     throw 'Not implemented';
     // remove line with error and write your code here
 };
-

src/hanoi-tower.js

@@ -1,4 +1,12 @@
-module.exports = function calculateHanoi(/* disksNumber, turnsSpeed */) {
-    throw 'Not implemented';
-    // remove line with error and write your code here
+module.exports = function calculateHanoi( disksNumber, turnsSpeed ) {
+    let obj = {
+        'turns' : 0 ,
+        'seconds' : 0,
+    }
+    // console.log ('hanoi in', disksNumber, turnsSpeed );
+    for(let i=1; i<=disksNumber;i++){
+        obj.turns = obj.turns*2 +1;
+    }
+    obj.seconds = obj.turns/ (turnsSpeed/ 3600);
+    return obj;
 }

src/recursive-depth.js

@@ -1,6 +1,18 @@
 module.exports = class DepthCalculator {
-    calculateDepth(/* arr */) {
-        throw 'Not implemented';
-        // remove line with error and write your code here
+    calculateDepth(arr) {
+        // console.log (arr)
+        if (!(Array.isArray(arr))) {
+            return 0;
+        } else {
+            let max = 0;
+            arr.forEach(element => {
+                if (Array.isArray(element)) {
+                    let tmp = this.calculateDepth(element);
+                    max = tmp > max ? tmp : max;
+                }
+            });
+            max++;
+            return max;
+        }
     }
 };

src/what-season.js

@@ -1,4 +1,54 @@
-module.exports = function getSeason(/* date */) {
-  throw 'Not implemented';
-  // remove line with error and write your code here
+module.exports = function getSeason(date) {
+  // console.log('in', date);
+  let testDate = new Date;
+  // for(let prop in testDate){
+  // console.log('test a 1',prop);
+  // }
+  for( let prop in date){
+    // console.log('test a 2',prop);
+    throw 'Error';
+  }
+  if (date == null) {
+    return 'Unable to determine the time of year!';
+    // remove line with error and write your code here  
+  }
+  if (testDate.__proto__ != date.__proto__) {
+    throw 'Error';
+  }
+
+  let month_num = date.getMonth();
+  // console.log('month_num', month_num);
+  {
+    switch (month_num) {
+      case 0:
+      case 1:
+      case 11:
+        {
+          console.log('winter');
+          return 'winter';
+        }
+      case 2:
+      case 3:
+      case 4:
+        {
+          console.log('spring');
+          return 'spring';
+        }
+      case 5:
+      case 6:
+      case 7:
+        {
+          console.log('summer');
+          return 'summer';
+        }
+      case 8:
+      case 9:
+      case 10:
+        {
+          console.log('fall');
+          return 'fall';
+        }
+    }
+  }
+
 };