I have a nodejs project in which a sample.js include two function function A depends on function B's callback .
// smaple.js
Both function are included in the same file
function B ( arg1 , callback ){
// do some async
async.map(arg1 , function(item, cb){
var a = item.a
var b = a*4
cb( null , {'a':a,'b':b})
},function(err , result){
callback(err , result)
} )
}
function A ( arg , callback ){
if(condition1){
callback(null , 1)
}else{
B ( arg , function( err , result){
if(err){
callback(err , result)
}
else if (result ==1 ){
callback ( null , 2)
}else{
callback ( null , 1)
}
})
}
}
Scenario 2
// function B is in outer.js and included as module
sample.js
var outerfunction = require('./outer.js');
function A ( arg , callback ){
if(condition1){
callback(null , 1)
}else{
outerfunction.B ( arg , function( err , result){
if(err){
callback(err , result)
}
else if (result ==1 ){
callback ( null , 2)
}else{
callback ( null , 1)
}
})
}
}
outer.js
function B ( arg1 , callback ){
// do some async
async.map(arg1 , function(item, cb){
var a = item.a
var b = a*4
cb( null , {'a':a,'b':b})
},function(err , result){
callback(err , result)
} )
}
module.exports.B = B ;
Does scenario 1 is a proper way to use function ? What will happen if this code run concurrently using cluster module?
Does scenario 2 is better way to use dependent function ? Is this code perform better on concurrent execution?
