feat: finished the strings exercise and reduce the size of the condit…

…ions.js

src/basics/conditions.js

@@ -18,11 +18,7 @@ export function isBiggerThan2(n) {
     throw new Error("Passed value is not a number");
 }
 
-  if (n > 2) {
-    return true 
-  } else {
-    return false
-  }
+  return n > 2
 }
 
 /**
@@ -37,10 +33,6 @@ export function isMult(n, m) {
   throw new Error("Passed m is not a number")
 }
 
-if (m % n && n % m === 0) {
-  return true
-} else {
-  return false
-}
+return m % n && n % m === 0
 
 }

src/basics/strings.js

@@ -7,5 +7,25 @@
  * @return {string} the resulting string, with all needle words transformed to newWord
  */
 export function findAndReplacePreservingCase(needle, haystack, newWord) {
-  // Write your code here
+  if (typeof newWord !== 'string' || typeof needle !== 'string') {
+    throw new Error("not a string");
+  }
+
+  return haystack.replaceAll(new RegExp(needle, 'gi'), (match) => {
+
+    let result = '';
+
+
+    for (let i = 0; i < match.length; i++) {
+
+      const newChar = newWord[i] || ''
+      if (match[i] === match[i].toUpperCase()) {
+        result += newChar.toUpperCase()
+      } else {
+        result += newChar.toLowerCase()
+      }
+    }
+
+    return result;
+  });
 }