Tutorial for local js debugging / Tip for easy readline() emulation

Programming languages Javascript
9

Nice one. I tried it with your code, worked for me:

const fs = require('fs');
function* __readline() {
    let lines = fs.readFileSync(0).toString().split(/\n/);
    while(lines.length) yield lines.shift();
    return false;
}
const _readline = __readline();
function readline() {
    return _readline.next().value;
}

let line, nr = 0;
while((line = readline()) !== false){
    if(line) console.log(nr++, line)    
}

And then:

$ node sync_read_stdin.js <<< $’ foo \n bar ’
0 ’ foo ’
1 ’ bar ’

Edit - I realised your issue is with the runs.
To have multiple runs i’d just have another delimiter for the runs. Or would that not solve your problem? Something like:

function* __readline() {
    let runs = fs.readFileSync(0).toString().split(/\n\n/);
    let lines = runs.map(s => s.split(/\n/));
    while(lines.length) yield lines.shift(); //or however you prefer to receive your run inputs
    return false;
}

$ node sync_read_stdin.js <<< $‘foo1 \n bar1 \n\n foo2 \n bar2’
0 [ 'foo1 ', ’ bar1 ’ ]
1 [ ’ foo2 ‘, ’ bar2’, ‘’ ]

(BTW those are single quotes, the code block didnt work and the quote block replaced the single quotes)