async-for-each

async-for-each

Asynchronous array iteration

async-for-each exposes a function to iterate over an array asynchronously. This is useful for iteration that must occur in an asynchronous context, or for iterating over long arrays without blocking the event loop.

Installation

npm install --save async-for-each

Usage

const asyncForEach = require("async-for-each");
    
const arr = [1, 2, 3, 4, 5];
asyncForEach(arr, function(value, index, next) {
    console.log("The value at %s is %s", index, value);
    doSomethingAsyncWithValue(value, function() {
        next();
    });
}, function() {
    console.log("Iteration complete!");
});

API

Functions

asyncForEach(array, iterator, callback)

Iterates over an array asynchronously.

Typedefs

iteratorCallback : function

The asyncForEach iterator callback.

finalCallback : function

The asyncForEach final callback.

asyncForEach(array, iterator, callback)

Iterates over an array asynchronously.

Kind: global function

Param	Type	Description
array	Array	The array over which to iterate.
iterator	iteratorCallback	The iterator function. Called with the signature iterator(value, index, next), where value is the current array value, index is the current index, and next is a function to be called when the next iteration should occur. IMPORTANT: if next() is never called in the iterator function, the iteration will never complete.
callback	finalCallback	The callback function. Called with the signature callback(error) when the iteration is complete.

iteratorCallback : function

The asyncForEach iterator callback.

Kind: global typedef

Param	Type	Description
value	*	The value currently being iterated over.
index	number	The index currently being iterated over
next	function	Called to indicate that the current iteration is over.

finalCallback : function

The asyncForEach final callback.

Kind: global typedef

Param	Type	Description
error	Error	Error that was raised during iteration, if any.