valid-parentheses solution

Author: krokerdile

valid-parentheses/krokerdile.js

@@ -0,0 +1,31 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+var isValid = function(s) {
+    let ch = {};
+    ch[')'] = '(';
+    ch['}'] = '{';
+    ch[']'] = '[';
+
+    let list = s.split('');
+    let stack = [];
+
+    list.forEach((ele)=>{
+        if(stack.length == 0){
+            stack.push(ele);
+        }else{
+            let len = stack.length;
+            if(stack[len-1] == ch[ele]){
+                stack.pop();
+            }else{
+                stack.push(ele);
+            }
+        }
+    })
+    if(stack.length == 0){
+        return true;
+    }else{
+        return false;
+    }
+};