CODEWITHSUNDEEP
javascriptnode.jsjsonfs
user10567932
user10567932

Reputation:

Node js with fs and setInterval

I have a error "Callback must be a function" with this code 

function saveCallback() {console.log("Sauvegarde du json")}
bot.login(TOKEN)
var test = '{"channelAlias":[]}'
setInterval(fs.writeFile('stockage.json',test,saveCallback), 300000)

Upvotes: 1

Views: 279

Answers (3)

Lakshaya Sood
Lakshaya Sood

Reputation: 92

var fs = require('fs')
function saveCallback() {console.log("Sauvegarde du json")}
var test = '{"channelAlias":[]}'
setInterval(function(){fs.writeFile('stockage.json',test,saveCallback)}, 3000)

please see the difference

below will NOT GIVE ERROR

function willReturnFunction(){
    return function(){
        console.log("welcome")
    }
}
setInterval(willReturnFunction(),1000)

below will GIVE ERROR (your case)

function willNotReturnFunction(){
    //returning something other than funtion
    // like fs.wrtiteFile function
    return "some string"
}
setInterval(willNotReturnFunction(),1000)

I hope this helps! NAVIN

Upvotes: 0

Mr.DeleteMyMessages
Mr.DeleteMyMessages

Reputation: 381

const saveCallback = () => {
    console.log(`Sauvegarde du json`)
}
bot.login(TOKEN)
const test = `{ "channelAlias": [] }`
setInterval(() => fs.writeFile(`./stockage.json`, test, saveCallback), 300000)

Upvotes: 0

Wainage
Wainage

Reputation: 5412

Try

function saveCallback() {console.log("Sauvegarde du json")}
bot.login(TOKEN)
var test = '{"channelAlias":[]}'
setInterval(() => { 
  fs.writeFile('stockage.json',test,saveCallback)
}, 300000)

setInterval's signature is setInterval(callbackFUNCTION, time)

Upvotes: 1

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