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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