Create _benchmarks/kv-vs-ng-vs-d-vs-halden.md

_benchmarks/kv-vs-ng-vs-d-vs-halden.md

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+---
+title: kv vs ng vs d vs halden
+setup: |
+
+tests:
+  -
+    name: kv
+    code: |
+      function clean(str) {
+
+      var cleanedStr = "";
+
+      for (var i = 0; i < str.length; i++) {
+       	let char = str[i];
+         let prevChar = str[i - 1];
+
+         if (!(char === " " && prevChar === " ") || i === 0) {
+           cleanedStr += char;
+         }
+       }
+      return cleanedStr; 
+      }
+  -
+    name: ng
+    code: |
+      function clean(str) {
+        return clean.replace(/\s+/g, " ")
+      }
+  -
+    name: d
+    code: |
+      function collapseSpaces(str) {
+      var out = ""
+      str.split(" ").forEach((c) => {
+      if (!!c) {
+      out += c + " "
+      }
+      })
+      return out.trim()
+      }
+  -
+    name: halden
+    code: |
+      function collapseSpaces(s) {
+      let result = '';
+       for (let i = 0; i < s.length; i++) {
+       	const c = s.charAt(i);
+         result += c;
+       	if (c === ' ') {
+         	while (i < s.length - 1 && s.charAt(i + 1) === ' ') {
+           	i++;
+           }
+         }
+       }
+       return result;
+      }
+---
+