extract identity function into util

yyx990803 · yyx990803 · commit 8567e7dcedfd · 2016-12-08T14:58:26.000-05:00
diff --git a/src/core/config.js b/src/core/config.js
@@ -1,6 +1,6 @@
 /* @flow */
 
-import { no, noop } from 'shared/util'
+import { no, noop, identity } from 'shared/util'
 
 export type Config = {
   // user
@@ -73,7 +73,7 @@ const config: Config = {
   /**
    * Parse the real tag name for the specific platform.
    */
-  parsePlatformTagName: (x: string): string => x,
+  parsePlatformTagName: identity,
 
   /**
    * Check if an attribute must be bound using property, e.g. value
diff --git a/src/core/instance/render.js b/src/core/instance/render.js
@@ -9,6 +9,7 @@ import VNode, {
 } from '../vdom/vnode'
 import {
   warn,
+  identity,
   isObject,
   toObject,
   nextTick,
@@ -167,7 +168,6 @@ export function renderMixin (Vue: Class<Component>) {
   }
 
   // filter resolution helper
-  const identity = _ => _
   Vue.prototype._f = function resolveFilter (id) {
     return resolveAsset(this.$options, 'filters', id, true) || identity
   }
diff --git a/src/shared/util.js b/src/shared/util.js
@@ -189,6 +189,11 @@ export function noop () {}
  */
 export const no = () => false
 
+/**
+ * Return same value
+ */
+export const identity = (_: any) => _
+
 /**
  * Generate a static keys string from compiler modules.
  */

Original file line number	Diff line number	Diff line change
`@@ -9,6 +9,7 @@ import VNode, {`
`9`	`9`	`} from '../vdom/vnode'`
`10`	`10`	`import {`
`11`	`11`	`warn,`
	`12`	`+ identity,`
`12`	`13`	`isObject,`
`13`	`14`	`toObject,`
`14`	`15`	`nextTick,`
`@@ -167,7 +168,6 @@ export function renderMixin (Vue: Class<Component>) {`
`167`	`168`	`}`
`168`	`169`
`169`	`170`	`// filter resolution helper`
`170`		`- const identity = _ => _`
`171`	`171`	`Vue.prototype._f = function resolveFilter (id) {`
`172`	`172`	`return resolveAsset(this.$options, 'filters', id, true) \|\| identity`
`173`	`173`	`}`