JavaScript passing values between functions [closed]

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I have to functions, one is within an external js file named "london.js" and one is within a HTML script.

I wish to take a value from the external file and insert it into my HTML script function.

 function initMap(cityLatLng) {
 map = new google.maps.Map(document.getElementById('map'), {
 zoom: 12,
 center: ldn,
}
 function loadLondon() {
 var ldn = {lat: 51.5, lng: -0.1}
}

I am not sure how to pass values through functions, I have tried putting the variable outside the function but it didn't work. I wish to make use of the var ldn in initMap.

Thanks in advance.

• epascarello: pass it when you call it? unclear what you really want.
• j08691: I see two functions with no calls to either. Please edit your question to include a minimal reproducible example
• messerbill: Possible duplicate of Javascript passing parameters to function
• khollenbeck: Which one is your external? And which one is your embedded script? Do you have control over the external script? Are you able to make changes to it?
• Overtime: @KrisHollenbeck initMap is internal and loadLondon is external, I am able to make changes to both, I just wish to make use of that variable within the other function

Answer 1

An alternative is to return that variable ldn and assign it to the property center:

function initMap(cityLatLng) {
 map = new google.maps.Map(document.getElementById('map'), {
 zoom: 12,
 center: loadLondon(),
}
function loadLondon() {
 var ldn = {lat: 51.5, lng: -0.1};
 // your logic with ldn;
 return ldn;
}

• Scott Sauyet: Although this sounds good in theory, the word load in the function makes me wonder if it's being loaded asynchronously, in which case, there is a lot more work to do.
• Overtime: @Ele there are other functions that may need to fill 'center' with other coordinates, such as a function named loadCardiff in the external file
• Ele: Please add more code to understand the whole context.