javascript calling console.log function with variable length

Question

i want to call console.log function with variable length argument

function debug_anything() { var x = arguments; var p = 'DEBUG from ' + (new Error).stack.split("\n")[2]; switch(x.length) { case 0: console.log(p); break; case 1: console.log(p,x[0]); break; case 2: console.log(p,x[0],x[1]); break; case 3: console.log(p,x[0],x[1],x[2]); break; case 4: console.log(p,x[0],x[1],x[2],x[3]); break; // so on.. } }

is there any (shorter) other way, note that i do not want this solution (since other methods from the x object (Argument or array) would be outputted.

console.log(p,x);

See my answer over here. stackoverflow.com/a/14667091 Regards, Hans — user2036140
– user2036140, Commented Feb 2, 2013 at 22:46

Gabriel Gartz · Accepted Answer · 2016-11-29 22:30:02Z

5

Yes, you can use apply

console.log.apply(console, /* your array here */);

The full code:

function debug_anything() { // convert arguments to array var x = Array.prototype.slice.call(arguments, 0); var p = 'DEBUG from ' + (new Error).stack.split("\n")[2]; // Add p to the beggin of x x.unshift(p); // do the apply magic again console.log.apply(console, x); }

edited Nov 29, 2016 at 22:30

answered Jan 5, 2013 at 6:48

Gabriel Gartz

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4 Comments

Kokizzu Over a year ago

ERROR! Uncaught TypeError: Function.prototype.apply: Arguments list has wrong type

zerkms Over a year ago

@Kiswono Prayogo: because of .call, not .apply. And console, not this

Gabriel Gartz Over a year ago

@KiswonoPrayogo I do a better example to fix it.

Gabriel Gartz Over a year ago

@KiswonoPrayogo sorry, but for log works was needed to pass console as it context. It will work now, you don't need to convert arguments to array if you want, but if you are using a array is better that must be an array hehe

Lyn Headley · Accepted Answer · 2013-01-05 06:59:18Z

function debug_anything() { var x = arguments; var p = 'DEBUG from ' + (new Error).stack.split("\n")[2]; console.log.apply(console, [p].concat(Array.prototype.slice.call(x))); }

+1 I like your code style, do the same as my one, but is stylish!

epoch · Accepted Answer · 2013-01-05 06:58:42Z

Just join the array

function debug_anything() { var x = Array.prototype.slice.call(arguments, 0); var p = 'DEBUG from ' + (new Error).stack.split("\n")[2]; console.log(p, x.join(', ')); }

ERROR: Uncaught TypeError: Object #<Object> has no method 'join'

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