Add Functions with params to Array Javascript (Node.js)

Question

I want to push functions with params to an array without getting them executed. Here is what i have tried so far:

 var load_helpers = require('../helpers/agentHelper/loadFunctions.js');
 var load_functions = [];
 load_functions.push(load_helpers.loadAgentListings(callback , agent_ids));
 load_functions.push(load_helpers.loadAgentCount(callback , agent_data));

But in this way functions gets executed while pushing. This Question provides similar example but without params. How can I include params in this example?

Are you bound to the array structure? Else I'd suggest a solution with an object containing references to the function and the arguments. — Marc Dix
– Marc Dix, Commented May 30, 2016 at 8:05
Yes I need to pass this array to async.parallel([] , callback()); There might be a workaround with object. — Sohaib Farooqi
– Sohaib Farooqi, Commented May 30, 2016 at 9:17

KMathmann · Accepted Answer · 2016-05-30 08:18:02Z

3

You have to bind the parameters to the function. The first parameter is the 'thisArg'.

function MyFunction(param1, param2){
   console.log('Param1:', param1, 'Param2:', param2)
}

var load_functions = [];
load_functions.push(MyFunction.bind(undefined, 1, 2));
load_functions[0](); // Param1: 1 Param2: 2

answered May 30, 2016 at 8:18

KMathmann

4443 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user663031 Over a year ago

No, you don't have to bind the parameters, although that's one approach. It's more readable and idiomatic with arrow functions to write () => Myfunction(1, 2).

score 1 · Accepted Answer · 2016-06-04 06:41:57Z

1

Push functions which do what you want:

load_functions.push(
  () => load_helpers.loadAgentListings(callback, agent_ids),      
  () => load_helpers.loadAgentCount   (callback, agent_data)
);

edited Jun 4, 2016 at 6:41

answered May 30, 2016 at 8:18

user663031

Comments

Krzysztof Safjanowski · Accepted Answer · 2016-05-30 08:31:41Z

You can wrap added elements with function like that, let's mock load_helpers

var load_helpers = {
  loadAgentListings: function(fn, args) {
    args.forEach(fn)
  }
}

And try to use it in that way:

var a = []

a.push(function() {
  return load_helpers.loadAgentListings(function(r) {
    console.log(r)
  }, ['a', 'b', 'c'])
})

a[0]() // just execution

All depends on what level you want to pass additional arguments, second proof of concept

var a = []

a.push(function(args) {
  return load_helpers.loadAgentListings(function(r) {
    console.log(r)
  }, args)
})

a[0](['a', 'b', 'c']) // execution with arguments

With the bindings:

var a = []

a.push(load_helpers.loadAgentListings.bind(null, (function(r) {return r * 2})))

console.log(a[0]([1, 2, 3])) // execution with additional parameters

Collectives™ on Stack Overflow

Add Functions with params to Array Javascript (Node.js)

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related