Why mixing interpolation and expressions is bad practice

Question

From the Docs:

Embedding interpolation markup inside expressions

Note: AngularJS directive attributes take either

Answer 1

Directives which expect Boolean values won't work:

ERRONEOUS

When the expression evaluates to the Boolean value false, interpolation will return the string "false". Strings that have length greater than zero are truthy. The ng-hide directive will always hide and never show the input element.

CORRECT