Arrays Done

Author: aether1a

arrays/exercises/part-five-arrays.js

@@ -2,10 +2,25 @@ 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(''));
+//  the purpose is to select with element to be affected
 
 //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(''));
+
+//  the purpose is to select with element to be affected
 
 //3) Do split or join change the original string/array?
+console.log(str);
+console.log(arr);
+//they do not
 
 //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 +4,22 @@ 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.
-
+let tools = holdCabinet1.concat(holdCabinet2);
+console.log(tools);
+// it does not, it stores the new values under 'tools'
+console.log(holdCabinet1);
 //2) Print a slice of two elements from each array. Does slice alter the original arrays?
-
+let misc = holdCabinet1.slice(0,2);
+let misc2 = holdCabinet2.slice(3,5);
+console.log(misc);
+console.log(holdCabinet1);
+console.log(misc2);
+console.log(holdCabinet2);
+// again, it does not
 //3) reverse the first array, and sort the second. What is the difference between these two methods? Do the methods alter the original arrays?
+holdCabinet1.reverse();
+console.log(holdCabinet1);
+holdCabinet2.sort();
+console.log(holdCabinet2);
+// sort() sorts the elements alphabetically and in ascending order, while reverse() simply puts them in opposite order
+// They both overwrite the original array

arrays/exercises/part-one-arrays.js

@@ -1,5 +1,12 @@
 //Create an array that can hold 4 items name practiceFile.
-
+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.push(42);
+console.log(practiceFile);
+practiceFile.push('hello')
+console.log(practiceFile);
 //Use a SetValue to add the items "false", and "-4.6" to the array.  Print the array to confirm the changes.
+practiceFile.push(false, -4.6, '87');
+console.log(practiceFile)

arrays/exercises/part-six-arrays.js

@@ -1,11 +1,46 @@
 //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.
+element1 = ['hydrogen', 'H', 1.008]
+element2 = ['helium', 'He', 4.003]
+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.
 
+//2) Define the array 'table', and use 'push' to add each of the element arrays to it. Print 'table' to see its structure.
+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[0]);
+console.log(table[0][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 dimension3 = [
+    [
+      [
+        "Level 1, Entry 1",
+        "Level 1, Entry 2"
+      ],
+      [
+        "Level 1, Entry 3",
+        "Level 1, Entry 4"
+      ]
+    ],
+    [
+      [
+        "Level 2, Entry 1",
+        "Level 2, Entry 2"
+      ],
+      [
+        "Level 2, Entry 3",
+        "Level 2, Entry 4"
+      ]
+    ]
+  ];
+  
+  console.log(dimension3[0][0][0]); 
+  console.log(dimension3[1][1][0]); 

arrays/exercises/part-three-arrays.js

@@ -3,7 +3,13 @@ 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).
-
+console.log(cargoHold.indexOf('instruction manual'));
+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 +1,21 @@
 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.unshift(1138);
+console.log(cargoHold);
+cargoHold.push('20 meters');
+console.log(cargoHold);
 
 //5) Use a template literal to print the final array and its length.
+console.log(`the final list is ${cargoHold} and it is ${cargoHold.length} long`);