I read that we can interpolate Javascript expressions. What is the list of valid Javascript expressions that we can interpolate? So far for interpolation I have a displayed property, eg. object.property, short expressions like {{1+1}} what else Javascript expressions can we interpolate?
Expressions in Angular2 are very similar to expressions in Angular in terms of the scope of what they allow.
JavaScript expressions that promote side effects are prohibited including
- Assignment (= +=, -=)
- Using the
newkeyword - Chaining expressions using a semicolon or comma
- Increment (++) and decrement operators
Furthermore, there is no support for bitwise operators like | or &
Generally, it's a good idea to put complex JavaScript logic inside a controller or component, instead of inside a view. This is because of the Separation of Concerns design principle and making code more modular and readable.
https://angular.io/docs/ts/latest/guide/template-syntax.html#!#template-expressions
You can use the Angular 2 default pipes for evaluating the expression inside an interpolation. Please refer the below link https://www.npmjs.com/package/angular2-pipes#sum
来源：https://stackoverflow.com/questions/38152475/angular2-what-expressions-can-we-interpolate-in-template