wednesday tests 10/2

bovas85 · Feb 10, 2016 · 19ff811 · 19ff811
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diff --git a/Js/find_sparse_arrays.js b/Js/find_sparse_arrays.js
@@ -0,0 +1,72 @@
+var dense = [];                    // declaring global variable to be picked up by function below
+Array.prototype.isSparse = function() {
+  dense = this.filter(function() { // filters the sparse array looking for undefined elements
+  return true;                     // to remove and returns the valid elements to the dense array
+});
+   if (dense.length < this.length) // if it's sparse the dense array will be x = sparse element short 
+   return true;                    // [,,,,,,] > [] or [,1,2,3] > [1,2,3]
+   else return false;              // if length is same array is not sparse.
+};
+
+// shorter
+
+Array.prototype.isSparse = function() {
+  return this.length !== Object.keys(this).length; // 
+}
+
+// test it below
+arr1 = [,,,,,];
+arr2 = [1,2,3,,];
+arr3 = [1,2,3];
+Array.prototype.isSparse = function() {
+  console.log(Object.keys(this).length);
+  return this.length !== Object.keys(this).length; // 
+}
+arr1.isSparse(); // returns log 0 and true while arr3 is 3 and false
+
+
+// another option with more test cases:
+
+/*there is one big problem with your test cases.
+Say we have an array as follows :
+var arr = [,1,2]
+We can use Object.keys to tell if arr is sparse.
+Object.keys(arr) // -> 2 != arr.length
+We then add a non-numeric property to arr
+arr.abc = 55
+Object.keys now return a false positive.
+Object.keys(arr) // 3 == arr.length
+*/
+
+Array.prototype.isSparse = function() {
+for(var i = 0; i < this.length; i++){
+if(!(i in this))
+return true
+}
+return false
+}
+
+/*
+for (var keys in this){
+       if (Object.keys(this).length === 0) return true;
+     }
+     
+     if (this[i] == undefined ) return false;
+     
+     
+Array.prototype.isSparse = function() {
+  for(i = 0; i < this.length; i++){
+      if (this[i] == null || this[i] == undefined){
+        console.log(this[i] + " is null");
+        if (this[i] + this[i+1] == NaN) {
+        console.log(this[i] + this[i+1] + " is NaN");
+        return true;
+        }
+        else {
+        console.log(this[i] + "is not null");
+        return false;
+        }
+      }
+   }
+}
+*/
diff --git a/Js/regex_count_lowercase2.js b/Js/regex_count_lowercase2.js
@@ -0,0 +1,13 @@
+function lowercaseCount(str){
+    var count = str.match(/[a-z]/g);
+    if (count === null || count == 0) return 0;
+    else return count.length;
+}
+
+//better:
+
+function lowercaseCount(str){
+    return (str.match(/[a-z]/g) || []).length
+}
+lowercaseCount("ABC123!@€£#$%^&*()_-+=}{[]|\':;?/>.<,~");
+lowercaseCount("abcABC123!@€£#$%^&*()_-+=}{[]|\':;?/>.<,~");
diff --git a/Py/automate_boring_exercises/exit_example.py b/Py/automate_boring_exercises/exit_example.py
@@ -0,0 +1,8 @@
+import sys
+
+while True:
+    print "Type exit to exit"
+    response = raw_input()
+    if response == "exit":
+        sys.exit()
+    print "You typed %s." % response
diff --git a/Py/automate_boring_exercises/first_exercise.py b/Py/automate_boring_exercises/first_exercise.py
@@ -0,0 +1,24 @@
+# this program says hello and asks for my name
+
+print "Hello World!"
+print "What is your name?" # asks for name
+my_name = raw_input()
+print "It is good to meet you, %s" % my_name
+print "The length of your name is %d" % len(my_name)
+print "What is your age?" # ask for age
+my_age = raw_input()
+print "You will be %d in a year" % (int(my_age) + 1)
+
+# this below works in Python 3
+
+"""
+print('Hello world!')
+print('What is your name?') # ask for their name
+myName = input()
+print('It is good to meet you, ' + myName)
+print('The length of your name is:')
+print(len(myName))
+print('What is your age?') # ask for their age
+myAge = input()
+print('You will be ' + str(int(myAge) + 1) + ' in a year.')
+"""
diff --git a/Py/automate_boring_exercises/flow control.py b/Py/automate_boring_exercises/flow control.py
@@ -0,0 +1,25 @@
+"""
+# while loop break
+
+while True:
+    print "Please type your name."
+    name = raw_input()
+    if name == "your name":
+	    break
+print "Thank you!"
+"""
+
+"""
+# while loop continue
+
+while True:
+    print "Who are you?"
+    name = raw_input()
+    if name != "Joe":
+        continue
+    print "Hello, %s. What is the password? (it is a fish.)" % name
+    password = raw_input()
+    if password == "swordfish":
+        break
+print "Access granted."
+"""
diff --git a/Py/automate_boring_exercises/for_while_exercise.py b/Py/automate_boring_exercises/for_while_exercise.py
@@ -0,0 +1,7 @@
+for number in range(11):
+    print number
+
+n = 0
+while n < 11:
+    print n
+    n += 1
diff --git a/Py/automate_boring_exercises/hello_func.py b/Py/automate_boring_exercises/hello_func.py
@@ -0,0 +1,9 @@
+def hello():
+    print "Howdy"
+	print "Howdy!!!"
+    print "Hello there."
+
+
+hello()
+hello()
+hello()
diff --git a/Py/automate_boring_exercises/if_exercise.py b/Py/automate_boring_exercises/if_exercise.py
@@ -0,0 +1,8 @@
+print "How much spam?"
+spam = input()
+if spam == 1:
+    print "Hello"
+elif spam == 2: # if would also allow printing the else statement here
+    print "Howdy"
+else:
+    print "Greetings"
diff --git a/Py/automate_boring_exercises/printrandom.py b/Py/automate_boring_exercises/printrandom.py
@@ -0,0 +1,3 @@
+import random
+for i in range(5):
+    print random.randint(1, 10)