Wait for user input from readline module (Node.Js)
I am creating a module to get experience and shorten some code. I have a piece of code which uses readline in a simplified manner, like var x = arkin.question("How old are you? ");. Readline doesn't wait for the answer. It produces this:
How old are you? undefined
Code:
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return response;
});
}
I call it like this:
var age = arkin.question("How old are you? ");
console.log(age);
I have tried using this code:
rl.question(q, (userInput) => {
rl.close;
response = userInput;
return response;
});
Yet I get the same result. Thanks in advance for your help.
javascript node.js node-modules readline
asked Dec 30 '18 at 20:17
Arkin SolomonArkin Solomon
808
add a comment |
I am creating a module to get experience and shorten some code. I have a piece of code which uses readline in a simplified manner, like var x = arkin.question("How old are you? ");. Readline doesn't wait for the answer. It produces this:
How old are you? undefined
Code:
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return response;
});
}
I call it like this:
var age = arkin.question("How old are you? ");
console.log(age);
I have tried using this code:
rl.question(q, (userInput) => {
rl.close;
response = userInput;
return response;
});
Yet I get the same result. Thanks in advance for your help.
javascript node.js node-modules readline
asked Dec 30 '18 at 20:17
Arkin SolomonArkin Solomon
808
add a comment |
I am creating a module to get experience and shorten some code. I have a piece of code which uses readline in a simplified manner, like var x = arkin.question("How old are you? ");. Readline doesn't wait for the answer. It produces this:
How old are you? undefined
Code:
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return response;
});
}
I call it like this:
var age = arkin.question("How old are you? ");
console.log(age);
I have tried using this code:
rl.question(q, (userInput) => {
rl.close;
response = userInput;
return response;
});
Yet I get the same result. Thanks in advance for your help.
javascript node.js node-modules readline
asked Dec 30 '18 at 20:17
Arkin SolomonArkin Solomon
808
I am creating a module to get experience and shorten some code. I have a piece of code which uses readline in a simplified manner, like var x = arkin.question("How old are you? ");. Readline doesn't wait for the answer. It produces this:
How old are you? undefined
Code:
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return response;
});
}
I call it like this:
var age = arkin.question("How old are you? ");
console.log(age);
I have tried using this code:
rl.question(q, (userInput) => {
rl.close;
response = userInput;
return response;
});
Yet I get the same result. Thanks in advance for your help.
javascript node.js node-modules readline
javascript node.js node-modules readline
asked Dec 30 '18 at 20:17
Arkin SolomonArkin Solomon
808
asked Dec 30 '18 at 20:17
Arkin SolomonArkin Solomon
808
asked Dec 30 '18 at 20:17
Arkin SolomonArkin Solomon
808
asked Dec 30 '18 at 20:17
Arkin SolomonArkin Solomon
808
asked Dec 30 '18 at 20:17
Arkin SolomonArkin Solomon
808
808
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
whenever you call arki.question it registeres the event listeners .on("line") and .on("close") then returns from the function. Whatever you returning from .on("close") event listener question function does not know about it, because it is no longer on the call stack. you can either use a callback or promises with async...await to get your result.
with callbacks
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q , cb ){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return cb(response);
});
};
you call it like this
var age = arki.question("how old are you? ", resp => {
console.log(resp);
});
with promises
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
return new Promise(( resolve , reject) => {
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
resolve(response);
});
});
};
you call it like this
arki.question("how old are you? ").then( response => console.log(response) );
or
; ( async () => {
console.log(await arki.question("how old are you? "));
})();
answered Dec 30 '18 at 20:37
0.sh0.sh
1,5701125
Ok, now i understand, but doing this is just as complex as using it normally. Thanks for your help!
– Arkin Solomon
Dec 30 '18 at 21:56
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
whenever you call arki.question it registeres the event listeners .on("line") and .on("close") then returns from the function. Whatever you returning from .on("close") event listener question function does not know about it, because it is no longer on the call stack. you can either use a callback or promises with async...await to get your result.
with callbacks
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q , cb ){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return cb(response);
});
};
you call it like this
var age = arki.question("how old are you? ", resp => {
console.log(resp);
});
with promises
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
return new Promise(( resolve , reject) => {
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
resolve(response);
});
});
};
you call it like this
arki.question("how old are you? ").then( response => console.log(response) );
or
; ( async () => {
console.log(await arki.question("how old are you? "));
})();
answered Dec 30 '18 at 20:37
0.sh0.sh
1,5701125
Ok, now i understand, but doing this is just as complex as using it normally. Thanks for your help!
– Arkin Solomon
Dec 30 '18 at 21:56
add a comment |
whenever you call arki.question it registeres the event listeners .on("line") and .on("close") then returns from the function. Whatever you returning from .on("close") event listener question function does not know about it, because it is no longer on the call stack. you can either use a callback or promises with async...await to get your result.
with callbacks
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q , cb ){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return cb(response);
});
};
you call it like this
var age = arki.question("how old are you? ", resp => {
console.log(resp);
});
with promises
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
return new Promise(( resolve , reject) => {
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
resolve(response);
});
});
};
you call it like this
arki.question("how old are you? ").then( response => console.log(response) );
or
; ( async () => {
console.log(await arki.question("how old are you? "));
})();
answered Dec 30 '18 at 20:37
0.sh0.sh
1,5701125
Ok, now i understand, but doing this is just as complex as using it normally. Thanks for your help!
– Arkin Solomon
Dec 30 '18 at 21:56
add a comment |
whenever you call arki.question it registeres the event listeners .on("line") and .on("close") then returns from the function. Whatever you returning from .on("close") event listener question function does not know about it, because it is no longer on the call stack. you can either use a callback or promises with async...await to get your result.
with callbacks
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q , cb ){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return cb(response);
});
};
you call it like this
var age = arki.question("how old are you? ", resp => {
console.log(resp);
});
with promises
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
return new Promise(( resolve , reject) => {
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
resolve(response);
});
});
};
you call it like this
arki.question("how old are you? ").then( response => console.log(response) );
or
; ( async () => {
console.log(await arki.question("how old are you? "));
})();
answered Dec 30 '18 at 20:37
0.sh0.sh
1,5701125
whenever you call arki.question it registeres the event listeners .on("line") and .on("close") then returns from the function. Whatever you returning from .on("close") event listener question function does not know about it, because it is no longer on the call stack. you can either use a callback or promises with async...await to get your result.
with callbacks
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q , cb ){
var response;
rl.setPrompt(q);
rl.prompt();
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
return cb(response);
});
};
you call it like this
var age = arki.question("how old are you? ", resp => {
console.log(resp);
});
with promises
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
exports.question = function(q){
var response;
rl.setPrompt(q);
rl.prompt();
return new Promise(( resolve , reject) => {
rl.on('line', (userInput) => {
response = userInput;
rl.close();
});
rl.on('close', () => {
resolve(response);
});
});
};
you call it like this
arki.question("how old are you? ").then( response => console.log(response) );
or
; ( async () => {
console.log(await arki.question("how old are you? "));
})();
answered Dec 30 '18 at 20:37
0.sh0.sh
1,5701125
answered Dec 30 '18 at 20:37
0.sh0.sh
1,5701125
answered Dec 30 '18 at 20:37
0.sh0.sh
1,5701125
answered Dec 30 '18 at 20:37
0.sh0.sh
1,5701125
1,5701125
Ok, now i understand, but doing this is just as complex as using it normally. Thanks for your help!
– Arkin Solomon
Dec 30 '18 at 21:56
add a comment |
Ok, now i understand, but doing this is just as complex as using it normally. Thanks for your help!
– Arkin Solomon
Dec 30 '18 at 21:56
Ok, now i understand, but doing this is just as complex as using it normally. Thanks for your help!
– Arkin Solomon
Dec 30 '18 at 21:56
Ok, now i understand, but doing this is just as complex as using it normally. Thanks for your help!
– Arkin Solomon
Dec 30 '18 at 21:56
add a comment |
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