Optimizations

tshemsedinov · tshemsedinov · commit 8cf7f3797751 · 2017-04-06T12:04:00.000+03:00
diff --git a/JavaScript/1-simple.js b/JavaScript/1-simple.js
@@ -5,7 +5,7 @@ Function.prototype.curry = function(...args) {
 };
 
 const projection = (fields, obj) => (Object
-  .keys(obj).filter(field => fields.indexOf(field) >= 0)
+  .keys(obj).filter(field => fields.includes(field))
   .reduce((hash, key) => (hash[key] = obj[key], hash), {})
 );
 
@@ -20,5 +20,5 @@ const persons = [
 const p1 = projection.curry(['name', 'born']);
 const p2 = projection.curry(['name']);
 
-const data = persons.map(p1).map(p2);
+const data = persons.map(p2).map(p2);
 console.dir(data);
diff --git a/JavaScript/3-cached.js b/JavaScript/3-cached.js
@@ -14,14 +14,14 @@ const md = {
   age: ['born', age]
 };
 
-function projection(meta) {
+const projection = (meta) => {
   const keys = Object.keys(meta);
   return obj => keys.reduce((hash, key) => (
     hash[key] = meta[key].reduce(
       (val, fn, i) => (i === 0 ? obj[fn] : fn(val)), null
     ), hash
   ), {});
-}
+};
 
 const p1 = projection(md);
 const data = persons.map(p1);
diff --git a/JavaScript/4-optimized.js b/JavaScript/4-optimized.js
@@ -14,7 +14,7 @@ const md = {
   age: ['born', age]
 };
 
-function projection(meta) {
+const projection = (meta) => {
   const keys = Object.keys(meta);
   return obj => {
     const hash = {};
@@ -27,7 +27,7 @@ function projection(meta) {
     });
     return hash;
   };
-}
+};
 
 const p1 = projection(md);
 const data = persons.map(p1);
