1078652 - Use console.log(array) before array.push() displays the value post-push

Status: RESOLVED DUPLICATE of bug 754861

(DevTools :: Console, defect)

Description

[Cheng Bao]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0
Build ID: 20140923175406

Steps to reproduce:

This is a simple js code:
<script>
    var array = [1, 2, 3];
    console.log(array);
    array.push(4);
</script>
open developer tool -> console,
run page contains above js code.

Looks like it only affect console.log(), other javascript that access array before .push() doesn't be affected. 

Although it is only affect developers, it is very frustrating when I tried to debug my code, and I kept looking at wrong places because of this bug.


Actual results:

It display 
"Array [ 1, 2, 3, 4 ]"
in console


Expected results:

Array [ 1, 2, 3 ]

Comment 1

[Boris Zbarsky [:bzbarsky]]

This has nothing to do with the JS engine.  console.log() lazily converts its first argument to a string is all.