a few more answers

Author: mgable

numberToRoman.js

@@ -0,0 +1,12 @@
+let thousands = ["", "M","MM","MMM", "MMM"]
+let hundreds = ["","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"]
+let tens = ["","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"]
+let ones = ["","I","II","III","IV","V","VI","VII","VIII","IX"]
+
+function intToRoman(num) {
+  let thousand = Math.floor(num / 1000)
+  let hundred = Math.floor(num / 100 % 10)
+  let ten = Math.floor(num / 10 % 10)
+  let one = Math.floor(num / 1 % 10)
+  return thousands[thousand] + hundreds[hundred] + tens[ten] + ones[one]
+}

palindromeNumber.js

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+/**
+ * @param {number} x
+ * @return {boolean}
+ */
+var isPalindrome = function(x) {
+    if (x < 0) {
+        return false
+    }
+    
+    return x.toString(10).split("").reverse().join("") === x.toString(10)
+};

reverse-2.js

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+/**
+ * @param {number} x
+ * @return {number}
+ */
+var reverse = function(x) {
+  let isNegative = x < 0 ? -1 : 1, s, result = []
+  if (isNegative === -1){
+    x *= -1
+  }
+  s = x.toString(10).split("")
+
+    while(s.length){
+        result.push(s.pop())
+    }
+    let value = parseInt(result.join(""),10)
+    if (Math.abs(value) >= Math.pow(2,31)-1){
+        return 0
+    }
+    
+    return isNegative * value
+};

reverse.js

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+/**
+ * @param {number} x
+ * @return {number}
+ */
+var reverse = function(x) {
+    let isNegative = x < 0;
+
+    let value = (x.toString().split("").reverse());
+    
+    if (isNegative) {
+      value.unshift(value.pop())
+    }
+    
+    value = value.join("");
+    
+    if (Math.abs(value) >= Math.pow(2,31) - 1) {
+        return 0;
+    }
+
+    return value
+};
+