Expressions are a feature of Angular. They are a subset of JavaScript commands in addition to some Angular function. Expressions are used in many places in Angular. For example, anytime you bind data, you can use an expression. This makes understanding expressions important.
An expression will be evaluated to a value, to a true statement, to a function in scope, or to a variable in scope. This makes them powerful, but they do have some limitations.
You can use some JavaScript, but not all JavaScript in an expression. Here are some of the things that you can and cannot do in JavaScript using expressions:
a + b
, a && b
, or a || b
if
statementWhen an expression is evaluated in Angular, it will use the scope that it is in. This means that you can use any object or function that is accessible in the scope. One difference is that you will not get access to the global window
. For example, you will not be able to use window.alert
in an expression.
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