exercises done

Author: vsangui2

arrays/exercises/part-five-arrays.js

@@ -2,10 +2,22 @@ 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";

arrays/exercises/part-four-arrays.js

@@ -5,6 +5,23 @@ let holdCabinet2 = ['orange drink', 'nerf toys', 'camera', 42, 'parsnip'];
 
 //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.
 
+newArray = holdCabinet1.concat(holdCabinet2);
+console.log(newArray);
+console.log(holdCabinet1);
+
 //2) Print a slice of two elements from each array. Does slice alter the original arrays?
 
+holdCabinet1.slice(1,3);
+holdCabinet2.slice(0,2);
+
+console.log(holdCabinet1);
+console.log(holdCabinet2);
+
 //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();
+holdCabinet2.sort();
+
+console.log(holdCabinet1);
+console.log(holdCabinet2);
+

arrays/exercises/part-one-arrays.js

@@ -1,5 +1,15 @@
 //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.splice(0,0,"42");
+console.log(practiceFile);
+
+practiceFile.splice(3,0,"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 +1,23 @@
 //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.
+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], table[1][0], 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.
+

arrays/exercises/part-three-arrays.js

@@ -3,7 +3,16 @@ 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

@@ -2,10 +2,27 @@ let cargoHold = ['oxygen tanks', 'space suits', 'parrot', 'instruction manual',
 
 //1) Use bracket notation to replace ‘slinky’ with ‘space tether’. Print the array to confirm the change.
 
+cargoHold.splice(5,1,"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 final array is ${cargoHold} with length of ${cargoHold.length}.`);

stringing-characters-together/code-snippets/bracket-notation.js

@@ -1,4 +1,15 @@
-let jsCreator = "Brendan Eich";
+// let jsCreator = "Brendan Eich";
 
-console.log(jsCreator[-1]);
-console.log(jsCreator[42]);
+// console.log(jsCreator[-1]);
+// console.log(jsCreator[42]);
+
+
+// let org = "  The LaunchCode Foundation ";
+// let trimmed = org.trim();
+
+// console.log(trimmed);
+
+let name = "Jack";
+let currentAge = 9;
+
+console.log(`Next year, ${name} will be ${currentAge + 1}.`);

stringing-characters-together/exercises/part-one.js

@@ -5,6 +5,17 @@ console.log(num.length);
 
 //Use type conversion to print the length (number of digits) of an integer.
 
+// console.log(String(num));
+// num = String(num);
+// console.log(num.length);
+
 //Follow up: Print the number of digits in a DECIMAL value (e.g. num = 123.45 has 5 digits but a length of 6).
 
+num /= 100;
+console.log(num)
+num = String(num)
+console.log(typeof num);
+console.log(num.replace('.', ''));
+
+
 //Experiment! What if num could be EITHER an integer or a decimal?  Add an if/else statement so your code can handle both cases.

stringing-characters-together/exercises/part-two.js

@@ -3,18 +3,21 @@
 let dna = " TCG-TAC-gaC-TAC-CGT-CAG-ACT-TAa-CcA-GTC-cAt-AGA-GCT    ";
 
 // First, print out the dna strand in it's current state.
+console.log(dna);
 
 //1) Use the .trim() method to remove the leading and trailing whitespace, then print the result.
 
-console.log(/* Your code here. */);
+console.log(dna.trim());
 
 //2) Change all of the letters in the dna string to UPPERCASE, then print the result.
 
-console.log();
+console.log(dna.toUpperCase());
 
 //3) Note that after applying the methods above, the original, flawed string is still stored in dna. To fix this, we need to reassign the changes to back to dna.
 //Apply these fixes to your code so that console.log(dna) prints the DNA strand in UPPERCASE with no whitespace.
 
+console.log(dna);
+dna = dna.trim().toUpperCase();
 console.log(dna);
 
 //Part Two Section Two
@@ -23,10 +26,24 @@ let dnaTwo = "TCG-TAC-GAC-TAC-CGT-CAG-ACT-TAA-CCA-GTC-CAT-AGA-GCT";
 
 //1) Replace the gene "GCT" with "AGG", and then print the altered strand.
 
-//2) Look for the gene "CAT" with ``indexOf()``. If found print, "CAT gene found", otherwise print, "CAT gene NOT found".
+console.log(dnaTwo.replace('GCT', 'AGG'));
 
+
+//2) Look for the gene "CAT" with ``indexOf()``. If found print, "CAT gene found", otherwise print, "CAT gene NOT found"
+if (dna.indexOf("CAT")){
+    console.log("CAT gene found");
+} else {
+    console.log("CAT gene NOT found");
+}
 //3) Use .slice() to print out the fifth gene (set of 3 characters) from the DNA strand.
+dna = dna.replace('GCT','AGG');
+console.log(dna);
 
 //4) Use a template literal to print, "The DNA strand is ___ characters long."
 
+dnaLength = dna.length;
+
+console.log(`"The DNA strand is ${dnaLength} characters long."`);
+
+
 //5) Just for fun, apply methods to ``dna`` and use another template literal to print, 'taco cat'.