js practice

scripts.js

@@ -1,32 +1,61 @@
 // FILL IN THE FUNCTIONS BELOW
 
 var sprintFunctions = {
-  largestEl: function(){  
-    // your code here
+  largestEl: function(array){
+    //this also works: return arr.sort().pop();
+    return array.reduce(function(a, b) {
+        return Math.max(a, b);
+    });
   },
-  
-  reversed: function(){  
-    // your code here
+
+  reversed: function(string){
+    return string.split("").reverse().join("");
   },
 
-  loudSnakeCase: function(){  
-    // your code here
+  loudSnakeCase: function(string){
+    string = string.replace(/[^\w\s]/gi, '').replace(/ +(?= )/g,'').split(' ');
+    string = string.map(function(el) {
+      return el.charAt(0).toUpperCase() + el.slice(1);
+    });
+    return string.join("_");
   },
 
-  compareArrays: function(){ 
-    // your code here (replace the return)
-    return "Finish compareArrays first!" 
+  compareArrays: function(a, b){
+    var areEqual = a.length === b.length && a.every((item, index) => b[index] === item);
+    return areEqual;
   },
 
-  fizzBuzz: function(){  
-    // your code here
+  fizzBuzz: function(num){
+    var array = [];
+    for (var i = 1; i <= num; i++) {
+      var f = i % 3 == 0, b = i % 5 == 0;
+      array.push(f ? b ? "FIZZBUZZ" : "FIZZ" : b ? "BUZZ" : i);
+    }
+    return array;
   },
 
-  myMap: function(){  
-    // your code here
+  myMap: function(array, func){
+    var results = [];
+    array.map(function(el) {
+       results.push(func(el));
+    });
+    return results;
   },
 
-  primes: function(){  
-    // your code here
+  primes: function(num){
+    var results = [];
+    function isPrime(n) {
+      if(n <= 1) return false;
+      const limit = Math.floor(Math.sqrt(n));
+      for(let i = 2; i <= limit; i++) {
+          if(n % i === 0) return false;
+      }
+      return true;
+    }
+    for(let i = 2; i <= num; i++) {
+        if(isPrime(i))
+          results.push(i);
+    }
+    return results;
   },
-}
+}