How to create an array entry for each line of a text file using node.js

Question

I am having difficulty creating an array entry out of each line of a text file in node.js

My array is called "temp." I am able to console.log each line in the following code:

var temp = [];
const readline = require('readline');
const fs = require('fs');
let rl = readline.createInterface({
    input: fs.createReadStream('./lib/Sphinx.txt')
});
let line_no = 0;
rl.on('line', function(line) {
    line_no++;
    console.log(line); //this successfully prints out every line
    temp.push(line); //this would ideally create a new array entry for each line

});

However, when I run this code:

console.log(temp.length)
//returns 0
console.log(temp.size)
//returns undefined

Asynchronous function calls are causing this to happen. As a result, I am unable to access the array values outside of the function itself, which is the only objective.

Help is appreciated. Thanks, Nakul

Sarfraaz talat · Accepted Answer · 2020-01-26 03:20:57Z

1

rl.on('line', function (line) {
    line_no++;
    console.log(line); //this successfully prints out every line
    temp.push(line); //this would ideally create a new array entry for each line
}).on('close', function (line) {
    // EOF
    console.log(temp);
    console.log(temp.length);
});;

Write console.log(temp.length) instead of console.log(temp.size) that should work
You should get complete array at the end of your line by line read, i.e. on close event.

edited Jan 26, 2020 at 3:20

answered Jan 26, 2020 at 3:13

Sarfraaz talat

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2 Comments

Nakul Tiruviluamala Over a year ago

I'm getting 0 for that.

Nakul Tiruviluamala Over a year ago

Thanks for the help. It turns out that my original code was actually correct. It was just a matter of asynchronous execution.

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