Have you read this?
https://github.com/caolan/async#waterfall
There's a simple example. i don't really see what more you could ask for
there.
On Saturday, September 6, 2014 5:52:26 PM UTC-4, Alex Brodov wrote:
>
> I have 2 function that i'm running asynchronously, i'd like to write them
> using the waterfalll model, the thing is that i don't know how.. Here is my
> code :
>
> var fs = require('fs');function updateJson(ticker, value) {
> //var stocksJson = JSON.parse(fs.readFileSync("stocktest.json"));
> fs.readFile('stocktest.json', function(error, file) {
> var stocksJson = JSON.parse(file);
>
>
>
> if (stocksJson[ticker]!=null) {
> console.log(ticker+" price : " + stocksJson[ticker].price);
> console.log("changing the value...")
> stocksJson[ticker].price = value;
> console.log("Price after the change has been made -- " +
> stocksJson[ticker].price);
> console.log("printing the the Json.stringify")
> console.log(JSON.stringify(stocksJson, null, 4));
> fs.writeFile('stocktest.json',JSON.stringify(stocksJson, null,
> 4) , function(err) {
> if(!err) {
> console.log("File successfully written");
> }
> if (err) {
> console.error(err);
> }
>
> }); //end of writeFile
> }
> else {
> console.log(ticker + " doesn't exist on the json");
> }
> });} // end of updaJson
>
> Any idea how can i write it using the waterfall so i'll be able to control
> this, Please write me some examples because i'm new to node.js
>
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