passing parameter in Javascript function in object

Question

I have this object:

{
    label: 'Field Label',
    key: 'field-key',
    operation: somefunctionWithParam(param)   
}

and function

const = somefunctionWithParam(val) => {
    return format(val)
} 

Operation function gets called from somewhere and it passes the value back. I need to pass a parameter from

somefunctionWithParam(param)

and access it from where I call it so that value can be manipulated based on parameter.

Answer 1

Operation function gets called from somewhere and it passes the value back

This happens because you are invoking the function while assigning it to the key operation .

Change your code to

const somefunctionWithParam = (val) => {
    return format(val)
}

and you can assign the function to the key operation like this

const obj = {
    label: 'Field Label',
    key: 'field-key',
    operation: somefunctionWithParam   
}

Or you can define an anonymous function like this

const obj = {
  label: 'Field Label',
  key: 'field-key',
  operation: (val) => {
      return format(val)
    }
}