Exercises: String

Author: Lbeckap

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

@@ -4,7 +4,25 @@ let num = 1001;
 console.log(num.length);
 
 //Use type conversion to print the length (number of digits) of an integer.
+console.log(String(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 = 123.45;
+let numString = String(num);
+
 //Experiment! What if num could be EITHER an integer or a decimal?  Add an if/else statement so your code can handle both cases.
+
+let stringLength = numString.length;
+
+//evaluates as truthy if there is a '.' at any index, but zero
+console.log('numString: ' + numString)
+console.log(numString.includes('.'));
+
+if (numString.includes('.')) {
+    
+    console.log(stringLength - 1);
+    
+} else {
+    console.log(stringLength);
+}

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

@@ -3,15 +3,27 @@
 let language = 'JavaScript';
 
 //1. Use string concatenation and two slice() methods to print 'JS' from 'JavaScript'
+let sliceJ = language.slice(0, 1);
+let sliceS = language.slice(4, 5);
+console.log(`${sliceJ}${sliceS}`);
 
 //2. Without using slice(), use method chaining to accomplish the same thing.
+let indexJ = language.indexOf('J');
+let indexS = language.indexOf('S');
+console.log(language[indexJ] + language[indexS]);
 
 //3. Use bracket notation and a template literal to print, "The abbreviation for 'JavaScript' is 'JS'."
+console.log(`The abbreviation for '${language}' is '${language[0]}${language[4]}'.`);
 
 //4. Just for fun, try chaining 3 or more methods together, and then print the result.
+console.log(language.toUpperCase().slice(0, 4).indexOf('V'));
 
 //Part Three section Two
 
 //1. Use the string methods you know to print 'Title Case' from the string 'title case'.
 
 let notTitleCase = 'title case';
+
+let TitleCase = notTitleCase.replace('t', 'T').replace('c', 'C');
+console.log(TitleCase);
+

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

@@ -3,17 +3,19 @@
 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.trim().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.
+dna = dna.trim().toUpperCase();
 
 console.log(dna);
 
@@ -23,10 +25,29 @@ 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.
 
+dnaTwo = dnaTwo.replace('GCT', 'AGG');
+console.log('dnaTwo: ' + dnaTwo)
+
 //2) Look for the gene "CAT" with ``indexOf()``. If found print, "CAT gene found", otherwise print, "CAT gene NOT found".
 
+if (dnaTwo.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.
 
+console.log(dnaTwo.slice(16, 19));
+
 //4) Use a template literal to print, "The DNA strand is ___ characters long."
+console.log(`The DNA strand is ${dnaTwo.length} characters long.`);
 
 //5) Just for fun, apply methods to ``dna`` and use another template literal to print, 'taco cat'.
+
+console.log(dnaTwo.indexOf('A')); 
+console.log(dnaTwo.toLowerCase());
+console.log(`----
+taco
+cat
+-----`);