finished exercises

Author: darrenoday

arrays/exercises/part-five-arrays.js

@@ -2,10 +2,20 @@ let str = 'In space, no one can hear you code.';
 let arr = ['B', 'n', 'n', 5];
 
 //1) Use the split method on the string to identify the purpose of the parameter inside the ().
-
+console.log(str.split());
+console.log(str.split('e'));
+console.log(str.split(' '));
+console.log(str.split(''));
 //2) Use the join method on the array to identify the purpose of the parameter inside the ().
-
+console.log(arr.join());
+console.log(arr.join('a'));
+console.log(arr.join(' '));
+console.log(arr.join(''));
 //3) Do split or join change the original string/array?
-
+console.log(str);
+console.log(arr);
 //4) We can take a comma-separated string and convert it into a modifiable array. Try it! Alphabetize the cargoHold string, and then combine the contents into a new string.
 let cargoHold = "water,space suits,food,plasma sword,batteries";
+
+console.log(cargoHold.split(',').sort().join(','));
+

arrays/exercises/part-four-arrays.js

@@ -4,7 +4,14 @@ let holdCabinet2 = ['orange drink', 'nerf toys', 'camera', 42, 'parsnip'];
 //Explore the methods concat, slice, reverse, and sort to determine which ones alter the original array.
 
 //1) Print the result of using concat on the two arrays. Does concat alter the original arrays? Verify this by printing holdCabinet1 after using the method.
-
+console.log(holdCabinet1.concat(holdCabinet2));
+console.log(holdCabinet1);
 //2) Print a slice of two elements from each array. Does slice alter the original arrays?
-
+console.log(holdCabinet1.slice (2,4));
+console.log(holdCabinet2.slice (0,2));
+console.log(holdCabinet1);
 //3) reverse the first array, and sort the second. What is the difference between these two methods? Do the methods alter the original arrays?
+console.log(holdCabinet1.reverse());
+console.log(holdCabinet2.sort());
+console.log(holdCabinet1);
+console.log(holdCabinet2);

arrays/exercises/part-one-arrays.js

@@ -1,5 +1,10 @@
 //Create an array called practiceFile with the following entry: 273.15
-
+let practiceFile = [273.15]
 //Use the bracket notation method to add "42" and "hello" to the array. Add these new items one at a time.  Print the array after each step to confirm the changes.
-
+practiceFile[1] = ("42")
+console.log(practiceFile)
+practiceFile[2] = ("hello")
+console.log(practiceFile)
 //Use a single .push() to add the following items: false, -4.6, and "87".  Print the array to confirm the changes.
+practiceFile.push(false, -4.6, "87" )
+console.log(practiceFile)

arrays/exercises/part-six-arrays.js

@@ -1,11 +1,38 @@
 //Arrays can hold different data types, even other arrays! A multi-dimensional array is one with entries that are themselves arrays.
 
 //1) Define and initialize the arrays specified in the exercise to hold the name, chemical symbol and mass for different elements.
-
+let element1 = ['hydrogen', 'H', 1.008];
+let element2 = ['helium', 'He', 4.003];
+let element26 = ['iron', 'Fe', 55.85];
 //2) Define the array 'table', and use 'push' to add each of the element arrays to it. Print 'table' to see its structure.
-
+let table = [];
+table.push(element1, element2, element26);
+console.log(table);
 //3) Use bracket notation to examine the difference between printing 'table' with one index vs. two indices (table[][]).
-
+console.log(table[1]);
+console.log(table[1][1]);
 //4) Using bracket notation and the table array, print the mass of element1, the name for element 2 and the symbol for element26.
-
+console.log(table[0][2]);
+console.log(table[1][0]);
+console.log(table[2][1]);
 //5) 'table' is an example of a 2-dimensional array. The first “level” contains the element arrays, and the second level holds the name/symbol/mass values. Experiment! Create a 3-dimensional array and print out one entry from each level in the array.
+let arr1 = [1,2,3];
+let arr2 = [4,5,6];
+let arr3 = [7,8,9];
+let arr4 = [10,11,12];
+let arr5 = [13,14,15];
+let arr6 = [16,17,18];
+let arr7 = [19,20,21];
+let arr8 = [22,23,24];
+let arr9 = [25,26,27];
+
+let item1 = [arr1, arr2, arr3];
+let item2 = [arr4, arr5, arr6];
+let item3 = [arr7, arr8, arr9];
+
+let array3D = [];
+array3D.push(item1,item2,item3);
+console.log (array3D);
+console.log(array3D[0]);
+console.log(array3D[0][0]);
+console.log(array3D[0][0][0]);

arrays/exercises/part-three-arrays.js

@@ -3,7 +3,11 @@ let cargoHold = [1138, 'space suits', 'parrot', 'instruction manual', 'meal pack
 //Use splice to make the following changes to the cargoHold array. Be sure to print the array after each step to confirm your updates.
 
 //1) Insert the string 'keys' at index 3 without replacing any other entries.
-
+cargoHold.splice(3,0,"keys")
+console.log(cargoHold)
 //2) Remove ‘instruction manual’ from the array. (Hint: indexOf is helpful to avoid manually counting an index).
-
+cargoHold.splice(4,1)
+console.log(cargoHold)
 //3) Replace the elements at indexes 2 - 4 with the items ‘cat’, ‘fob’, and ‘string cheese’.
+cargoHold.splice(2,3, 'cat', 'fob', 'string cheese')
+console.log(cargoHold)

arrays/exercises/part-two-arrays.js

@@ -1,11 +1,20 @@
 let cargoHold = ['oxygen tanks', 'space suits', 'parrot', 'instruction manual', 'meal packs', 'slinky', 'security blanket'];
 
 //1) Use bracket notation to replace ‘slinky’ with ‘space tether’. Print the array to confirm the change.
-
+ cargoHold[5] = ('space tether');
+ 
+ console.log (cargoHold)
 //2) Remove the last item from the array with pop. Print the element removed and the updated array.
+console.log(cargoHold.pop());
 
+console.log(cargoHold);
 //3) Remove the first item from the array with shift. Print the element removed and the updated array.
+console.log(cargoHold.shift());
 
+console.log(cargoHold);
 //4) Unlike pop and shift, push and unshift require arguments inside the (). Add the items 1138 and ‘20 meters’ to the the array - the number at the start and the string at the end. Print the updated array to confirm the changes.
-
+cargoHold.push('20 meters');
+cargoHold.unshift(1138);
+console.log(cargoHold);
 //5) Use a template literal to print the final array and its length.
+console.log(`The array ${cargoHold} has a length of ${cargoHold.length}.`);