Injecting a variable into a string before adding it to a pre-existing array

Trying to insert a variable into a string while adding the string itself to an existing array like this:

var myVar = 'slug';

myArray.push(['item one', '/path/to/' + myVar + '/']);

This approach is not yielding the expected results. Despite correctly assigning a value to myVar, the array does not recognize it as a variable.

Seems simple, but obviously missing a key detail here.

Appreciate any assistance on this matter.

UPDATE: Issue not related to Javascript.

As Alex pointed out, this typically should work. (And yes, the array is already existing.)

However, I failed to mention that the push method is embedded within Django templating logic to only execute on my development instance, as shown below:

{% ifequal INSTANCE 'DEVELOPMENT' %]
myArray.push(['item one', '/path/to/' + myVar + '/']);
{% endifequal %}

I didn't think the logic was causing problems. I confirmed that:

  1. the logic was functioning correctly
  2. INSTANCE was indeed 'DEVELOPMENT'
  3. and the JavaScript line was present in the source code, indicating no issues with the logic.

However, removing the Django logic allows the JavaScript to work as intended.

Curiously, this server-side logic is preventing any external values from being inserted into the array, whether client- or server-side.

In an attempt to troubleshoot, I tried this...

myArray.push(['item one', '/path/to/{{ block slug }}undefined{{ endblock }}/']);

...with the following code in a child template.

{{ block slug }}slug{{ endblock }}

The issue persists - when the template logic is active, the value becomes /path/to/undefined. Without it, the value appears as /path/to/slug as expected.

The cause of this anomaly remains unclear to me. While I can find a workaround, open to any insights anyone might have.

Thanks once more.


Newcomer question: what's the protocol for changing post titles on Stack Overflow?

Answer №1

It absolutely works.

Maybe your intention was to combine the Array instead, using concat()? Currently, you are pushing a new Array onto the current Array, creating a multi-dimensional Array.

I also assumed myArray was already referencing an Array. If not, simply use var myArray = [].

Answer №2

In order to successfully add an item using the push method, it is crucial to first create and initialize the array:

let product = 'shoes';
let shoppingCart = new Array();
shoppingCart.push(['Nike sneakers', '/shop/' + product + '/']);

Answer №3

What seems to be the issue?

It appears that you are nesting an array within another array.

To access the elements of the new arrays correctly, follow this syntax:

myArray[0][1] // This represents "/path/to/slug/

Upon reviewing your comments, it appears that you are attempting to access a property of the array:

myArray.myVar

In JavaScript, if you want to have a named element, you should use an object instead.

myObject = {};
myObject.myVar = "/path/to/slug/";
alert(myObject.myVar) // Result will be: "/path/to/slug/"

Alternatively, you can directly add the property to the array itself:

myArray.myVar = "/path/to/slug/";
alert(myArray.myVar);

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