Javascript reusable functions

Question

I have 2 functions with the same logic (eg: printing in console multiple concatenated elements) but with one specificity. The easy way is to specify the specificity in parameter, like this :

function baseLogic (specific, general) {
  // ... many processes before here
  if(specific == "info") console.info(general)
  if(specific == "warn") console.warn(general)
}

// Calls
baseLogic("info", "foo")
baseLogic("warn", "bar")

However, i would like to handle this specificity with a function, not as a parameter, like this :

function baseLogic (specific, general) {
  // ... many processes before here
  if(specific == "info") console.info(general)
  if(specific == "warn") console.warn(general)
}

function info(general) {
  baseLogic("info", general)
}

function warn(general) {
  baseLogic("warn", general)
}

// Calls
info("foo")
warn("foo")

Problem is, when i want to add/remove a parameter, for example, i need to add/remove it everywhere

Is there any way to do it better ?

Something like this :

function baseLogic (specific, general) {
  // ... many processes before here
  if(specific == "info") console.info(general)
  if(specific == "warn") console.warn(general)
}
info = baseLogic("info")
warn = baseLogic("warn")

// Calls
info("foo")
warn("bar")

Thanks in advance !

You question is unclear. But it seems you want to create a and b functions dynamically? — Maheer Ali
– Maheer Ali, Commented Mar 7, 2019 at 13:22
I've updated the description, it was in fact a little blurry... — julient
– julient, Commented Mar 7, 2019 at 15:52
Where "general" argument are passed in ? this is not passed to the original funcions (info, warn) — Mosè Raguzzini
– Mosè Raguzzini, Commented Mar 7, 2019 at 17:17

Mosè Raguzzini · Accepted Answer · 2019-03-07 13:30:42Z

1

Maybe what you are looking for are curry functions:

// no curry
const sum = (a, b) => a + b

// no curry usage
sum(3, 4)

// curry
const sum = a => b => a + b

// curry usage
sum (2)(1);

Ref: https://medium.com/front-end-weekly/javascript-es6-curry-functions-with-practical-examples-6ba2ced003b1

answered Mar 7, 2019 at 13:30

Mosè Raguzzini

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1 Comment

julient Over a year ago

Thanks for the answer but it's not what i'm looking for. I've updated the description to be more precise.

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