strings afgewerkt

exercise_4.js

@@ -1,27 +1,26 @@
 let num = 4_000;
 let str = num.toString();
-console.log(str.length);
+console.log(str.length);  // of console.log(String(num).length)
 
 let dec = 123.45;
 console.log(dec.toFixed(0));
 
-let int = 10;
+let int = 10.3;
 
 if (Number.isInteger(int))
 {
-  console.log('Number is a integer');
+  console.log(String(int).length);
 }
   else {
-    console.log('Number is a decimal')
+    console.log(String(int).length -1);
   };
 
 let dna = ' TCG-TAC-gaC-TAC-CGT-CAG-ACT-TAa-CcA-GTC-cAt-AGA-GCT ';
-dna = dna.trim()
-dna = dna.trim().toLocaleUpperCase();
-
-
+// trim() verandert de oude string in een nieuwe string, maar de oude blijft behouden
+dna = dna.trim().toUpperCase();
 console.log(dna);
 
+
 dna = dna.replace('GCT', 'AGG');
 console.log(dna);
 
@@ -36,6 +35,14 @@ if (dna.indexOf('CAT') === -1)
 dna = dna.slice(16, 19);
 console.log(dna);
 
-console.log('The DNA strand is', dna.length, 'characters long');
+console.log(`The DNA strand is ${dna.length} characters long`);
+dna = ' TCG-TAC-gaC-TAC-CGT-CAG-ACT-TAa-CcA-GTC-cAt-AGA-GCT ';
+dna = dna.trim();
+console.log(`${dna.slice(4,7).toLowerCase()}o ${dna.slice(40,43).toLowerCase()}`);
+
+let s = "'JavaScript'";
+console.log(`The abbreviation for ${s} is ${s.slice(0,2) + s.slice(5,6) + s.slice(11)}.`); 
 
-console.log(dna.replace(dna, 'TAC0 CAT'));
+console.log(s.replace('ava', '').replace('cript', ''));
+let c = 'title case'.replace('t', 'T').replace('c','C');
+console.log(c);