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Date: Wed, 4 Apr 2012 11:21:47 +0200
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Subject: Re: [mozilla-rhino] more efficient way to do String concat
From: =?ISO-8859-1?Q?Hannes_Walln=F6fer?= <hann...@gmail.com>
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1.7 is on the master branch.

Hannes

2012/4/4 Wei Xue <wei.xu...@gmail.com>:
> Hannes, what's the branch name for 1.7R4? Thanks. I don't see it in the
> following list.
>
> Rhino1_7R3_RELEASE: 1.70
> head: 1.62
> Rhino1_7R2_BRANCH: 1.62.0.2
> BEFORE_AST: 1.62
> Rhino1_7R1_BRANCH: 1.59.0.2
> Rhino1_6R7_BRANCH: 1.57.0.4
> Rhino1_6R6_RELEASE: 1.57
> Rhino1_6R6_BRANCH: 1.57.0.2
> RHINO_2007_02_05_08_30: 1.1.1.1
> MOZILLA: 1.1.1
> Rhino1_6R5_RELEASE: 1.52.2.2
> Rhino1_6R4_RELEASE: 1.52
> Rhino1_6R3_PATCH: 1.52.0.2
> JS_1_7_ALPHA_MERGE: 1.52
> Rhino1_6R3_RELEASE: 1.52
> SUNBIRD_0_3a2_RELEASE: 1.52
> Rhino1_6R2_RELEASE: 1.51
> PREFERENCES_20050201_BRANCH: 1.49.0.2
> PREFERENCES_20050201_BASE: 1.49
> before_simpler_undefined_280047: 1.49
> Rhino1_6R1_RELEASE: 1.49
> BEFORE_E4X: 1.44
> Rhino150R5_RELEASE: 1.38
> before_225831_merge: 1.37
> templess_bytecode_225831: 1.37.0.2
> before_less_classes_optimizer: 1.33
> Rhino150R4_1_RELEASE: 1.29
> Rhino150R4_BRANCH: 1.29.0.2
> Rhino150R4_RELEASE: 1.29
> less_static: 1.21.0.2
> Rhino150R3_RELEASE: 1.20
> EDITOR_EMBEDDING_20011025_BRANCH: 1.16.0.2
> EDITOR_EMBEDDING_20011025_BASE: 1.16
> Rhino150R2_RELEASE: 1.20
> Rhino150R2_BRANCH: 1.20.0.2
> before_new_natives: 1.11
> before_jsdebugger: 1.9
> EXP_DEBUGGER: 1.8.0.2
> Rhino150R1_RELEASE: 1.8
> Rhino150R1_BRANCH: 1.8.0.4
> ClassGen_BRANCH: 1.4.0.2
> Rhino140R3_BRANCH: 1.1.0.2
> Rhino140R3_RELEASE: 1.1
>
>
> 2012/3/14 Hannes Walln=F6fer <hann...@gmail.com>
>>
>> Current Rhino git snapshot and 1.7R4 which is due very soon has
>> optimized String concatenation, so using + to build strings should be
>> comparable to array join() in terms of performance.
>>
>> Hannes
>>
>> 2012/3/13 Wei Xue <wei.xu...@gmail.com>:
>> > Some of our scripts have a lot of String concat which causes high GC i=
n
>> > the
>> > server causing by allocating array. =A0 I wonder in Rhino, is there
>> > equivalent
>> > of StringBuffer?=A0 If I write my scrip in the following way, will it =
be
>> > efficient when running in Rhino?
>> >
>> > var buf=3D [];
>> > buf.push('some string');
>> > buf.toString();
>> >
>> > to replace following:
>> >
>> > var buf=3D'';
>> > buf+=3D'some string';
>> >
>> > Thanks!
>> >
>> > Michelle
>
>