5dc35b527b
This commit disables promise unwrapping and adds $parseProvider.unwrapPromises() getter/setter api that allows developers to turn the feature back on if needed. Promise unwrapping support will be removed from Angular in the future and this setting only allows for enabling it during transitional period. If the unwrapping is enabled, Angular will log a warning about each expression that unwraps a promise (to reduce the noise, each expression is logged only onces). To disable this logging use `$parseProvider.logPromiseWarnings(false)`. Previously promises found anywhere in the expression during expression evaluation would evaluate to undefined while unresolved and to the fulfillment value if fulfilled. This is a feature that didn't prove to be wildly useful or popular, primarily because of the dichotomy between data access in templates (accessed as raw values) and controller code (accessed as promises). In most code we ended up resolving promises manually in controllers or automatically via routing and unifying the model access in this way. Other downsides of automatic promise unwrapping: - when building components it's often desirable to receive the raw promises - adds complexity and slows down expression evaluation - makes expression code pre-generation unattractive due to the amount of code that needs to be generated - makes IDE auto-completion and tool support hard - adds too much magic BREAKING CHANGE: $parse and templates in general will no longer automatically unwrap promises. This feature has been deprecated and if absolutely needed, it can be reenabled during transitional period via `$parseProvider.unwrapPromises(true)` api. Closes #4158 Closes #4270
AngularJS 
AngularJS lets you write client-side web applications as if you had a smarter browser. It lets you use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly. It automatically synchronizes data from your UI (view) with your JavaScript objects (model) through 2-way data binding. To help you structure your application better and make it easy to test, AngularJS teaches the browser how to do dependency injection and inversion of control. Oh yeah and it also helps with server-side communication, taming async callbacks with promises and deferreds; and make client-side navigation and deeplinking with hashbang urls or HTML5 pushState a piece of cake. The best of all: it makes development fun!
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