Chrome JavaScript developer console: Is it possible to call console.log() without a newline?

Question

I\'d like to use console.log() to log messages without appending a new line after each call to console.log(). Is this possible?

Answer 1

The short answer is no.

But

If your use-case involves attempting to log perpetually changing data while avoiding console-bloat, then one way to achieve this (in certain browsers) would be to use console.clear() before each output.

function writeSingleLine (msg) {

  console.clear();
  console.log(msg);

}

writeSingleLine('this');
setTimeout( function () { writeSingleLine('is'); }, 1000);
setTimeout( function () { writeSingleLine('a'); }, 2000);
setTimeout( function () { writeSingleLine('hack'); }, 3000);

Note that this would probably break any other logging functionality that was taking place within your application.

Disclaimer: I would class this as a hack.

Answer 2

If your only purpose to stop printing on many lines, One way is to group the values if you don't want them to fill your complete console

P.S.:- See you browser console for output

let arr = new Array(10).fill(0)


console.groupCollapsed('index')

arr.forEach((val,index) => {
  console.log(index)
})

console.groupEnd()

console.group

console.groupCollapsed

Answer 3

You can use a spread operator to display output in the single line. The new feature of javascript ES6. see below example

   for(let i = 1; i<=10; i++){
        let arrData = [];
        for(let j = 1; j<= 10; j++){
            arrData.push(j+"X"+i+"="+(j*i));
        }
        console.log(...arrData);
    }

That will print 1 to 10 table in single line.

Answer 4

if you want for example console log array elements without a newline you can do like this

const arr = [1,2,3,4,5];

Array.prototype.log = (sep='') => {
    let res = '';
    for(let j=0; j<this.lengthl j++){
        res += this[j];
        res += sep;
    }
    console.log(res);
}

// console loging

arr.log(sep=' '); // result is: 1 2 3 4 5 

Answer 5

Something about @shennan idea:

function init(poolSize) {
      var pool = [];
      console._log = console.log;
      console.log = function log() {
        pool.push(arguments);
        while (pool.length > poolSize) pool.shift();
    
        draw();
      }
      console.toLast = function toLast() {
        while (pool.length > poolSize) pool.shift();
        var last = pool.pop() || [];
        for (var a = 0; a < arguments.length; a++) {
            last[last.length++] = arguments[a];
        }
        pool.push(last);
    
        draw();
      }
      function draw() {
        console.clear();
        for(var i = 0; i < pool.length; i++)
          console._log.apply(console, pool[i]);
      }
    }
    
    function restore() {
      console.log = console._log;
      delete console._log;
      delete console.toLast;
    }
    
    init(3);
    console.log(1);
    console.log(2);
    console.log(3);
    console.log(4);    // 1 will disappeared here
    console.toLast(5); // 5 will go to row with 4
    restore();

Answer 6

In NodeJS you can use process.stdout.write and you can add '\n' if you want.

console.log(msg) is equivalent to process.stdout.write(msg + '\n').