Unusual behavior observed when calculating in Angular

Utilizing Angular.js, I dynamically calculate the height and add the value to the CSS style attribute within an ng-repeat loop.

The issue arises with this particular line of code:

<div style="height: {{60.0 / 100.0 * (100 - (100.0 / 0.27 * (item.wert + 1.0 - 0.95)))}}%; ">
    <p>{{item.wert}}</p>
</div>

By simply multiplying item.wert by a factor of 1, the calculation becomes correct. Thus, this adjusted line works as expected:

<div style="height: {{60.0 / 100.0 * (100 - (100.0 / 0.27 * ((item.wert * 1.0) + 1.0 - 0.95)))}}%; ">
    <p>{{item.wert}}</p>
</div>

Could anyone shed light on why this multiplication by 1 is necessary? Thank you!

Answer №1

It seems like the value of item.wert is being treated as a string instead of an integer. Therefore, when you multiply it by 1, JavaScript automatically converts it to an integer allowing for calculations to be made.

Answer №2

The data type of item.wert is determined by the value it holds. For instance, consider the code snippet below which outputs string:

$scope.item={};
$scope.item.wert = "";
console.log(typeof($scope.item.wert)) //string;  

On the other hand, the following code will output a number:

$scope.item={};
$scope.item.wert = 2;
console.log(typeof($scope.item.wert)) //number;

Hence, the outcome of your expression can vary based on the content stored within item.wert.

Check out the Arithmetic operators article on MDN for more insights.

Addition (+):

// When adding Number + String -> concatenation
5 + "foo" // "5foo"

Subtraction (-):

 // When subtracting Number - String -> NaN
    "foo" - 3 // NaN

Multiplication (*)

// While multiplying Number * String -> NaN
"foo" * 2 // NaN

I trust that the above information addresses your query.

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