CODEWITHSUNDEEP
node.js
Azevedo
Azevedo

Reputation: 2189

Handling multiple child processes in node.js

I have this download manager that will donwload files from queue[] in a wget separated child process each.

However, after the download is complete and the callback is called I need to handle queue[i] but I don't know which queue index is it.

const EXEC_FILE = require('child_process').execFile; /** https://nodejs.org/api/child_process.html */

queue = []; /** array with download urls */

function startDownload(i){    
    var downloadProccess = EXEC_FILE(
        wget, [ queue[i] ],
        (error, stdout, stderr) => { 

            /** callback after EXEC_FILE completed or aborted */
            /** HERE! How do I get the index i? */

    });   
}

startDownload(1);
startDownload(3);
startDownload(9);

How do I get the i value after the process is complete?

Upvotes: 0

Views: 788

Answers (1)

lorefnon
lorefnon

Reputation: 13115

Javascript functions are closures. So you already have the variable i inside the function body.

Upvotes: 1

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