What could be causing Angular to behave strangely with varying strings?

I have recently delved into learning angular JS and I find myself struggling with some basic concepts.

Current Situation: I am experimenting with two strings - postNumber123 and 123preNumber. Angular is throwing an error when the string starts with a number, but it works fine if it starts with characters. I am curious to understand the reason behind this behavior. Am I overlooking something?

Angular behaving as expected:

<div ng-app="" >
     <div> Testing : {{ postNumber123 }} </div>  <!-- no error --> 
    <div>After execution : {{ 3+4 }} </div>
</div>

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="" >
    
    <!-- <div> Testing : {{ 123preNumber }} </div> --> <!-- showing error -->
    
     <div> Testing : {{ postNumber123 }} </div>  <!-- no error --> 
    
    <div>After execution : {{ 3+4 }} </div>
    
</div>

Error encountered for this scenario:

<div ng-app="" >
    <div> Testing : {{ 123preNumber }} </div> <!-- displaying error -->
    <div>After execution : {{ 3+4 }} </div>
</div> 

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="" >
        <div> Testing : {{ 123preNumber }} </div> <!-- displaying error -->
        
        <!-- <div> Testing : {{ postNumber123 }} </div> --> <!-- no error --> 
        
        <div>After execution : {{ 3+4 }} </div>
        
    </div>
    

Thank you!

Answer №1

123preNumber is not a valid variable name as it begins with a number. It is recommended to use the variable name postNumber123 instead. Please refer to this link for further information.

Answer №2

123preNumber does not meet the criteria for a proper JavaScript expression.

postNumber123 is considered to be a valid JavaScript variable identifier.

Answer №3

In most computer languages, variable names must always begin with alphabetic characters, underscores (_), or dollar signs ($). This same validation rule applies when working with AngularJS, so be mindful of this when declaring any variables in your code.

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