From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from primenet.com.au (ns1.primenet.com.au [203.24.36.2]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id 7437dc38 for ; Sun, 8 Sep 2019 09:00:01 +0000 (UTC) Received: (qmail 15973 invoked by alias); 8 Sep 2019 08:59:52 -0000 Mailing-List: contact zsh-users-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Users List List-Post: List-Help: List-Unsubscribe: X-Seq: 24240 Received: (qmail 4936 invoked by uid 1010); 8 Sep 2019 08:59:52 -0000 X-Qmail-Scanner-Diagnostics: from mail-vs1-f48.google.com by f.primenet.com.au (envelope-from , uid 7791) with qmail-scanner-2.11 (clamdscan: 0.101.2/25559. spamassassin: 3.4.2. Clear:RC:0(209.85.217.48):SA:0(-2.0/5.0):. Processed in 2.05288 secs); 08 Sep 2019 08:59:52 -0000 X-Envelope-From: sgniazdowski@gmail.com X-Qmail-Scanner-Mime-Attachments: | X-Qmail-Scanner-Zip-Files: | Received-SPF: pass (ns1.primenet.com.au: SPF record at _netblocks.google.com designates 209.85.217.48 as permitted sender) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=xX0wf3nez/piTqPt06zeGvT4Z+W7639DjymeXT+woCs=; b=czZYvDB77fmU6YMWsMINULAPDFUWncH+rsOPm158/5w23IHLpy+9E+WRNJ5hzT0jMR n86BBUGTHyESG8hNNYwfzV3KywrtKfULiCh1llGeSs04OcWfj5y5RRAwkLKDPsLLeUpG Ojo9sbrdfsUWsMghaZ8Jh5rQTHTxpHtNtiEU4v1iMxWbXjSiawBGOCEgiyAojNloVl6Y qaF4aFHGYk8E1gpbqqVr6NTmGDcubZG7aPSyNWoBFs2jFo3ujxT5hKKJ6iwDSyfPdxLd dO3xawjv7PoSpx6+AeqI5C5uPG1eZTWr5YcTuR5jlxBnwWPwUPjbZc1E0qNIU/07YDxN FFTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=xX0wf3nez/piTqPt06zeGvT4Z+W7639DjymeXT+woCs=; b=NEqp58pJyddMBCKjjgYRyYKnVN/IZzRZsGXMhKYlyVqSKoL0iW6BY7W40VRuoQslNO W93R3SlcTOvSKz8NuQ9flIlkbGG9AkpeirmfqpQ5jytN7vONjyaSgtyz6RS/2M9Wyxuk 4mXpA9c/37uPL98e6sGksF0Vl4ema/elFy+U0W7Nr3VPlfYN4ztQe/e9mhtCqX/2mbpR AaBSBgAd+1Sm3hUQ5GiAWsrckFhRSC5Enwy2mrvDyW6yBPEBNs1lffkAtXr4eXYQXQHf wuS1OVFFfls7OUIy1reaiOPntLFb3m4BcAsbbXarwXUSrtvZE7jXe8dL+MSSKpo3IU3C 11Dw== X-Gm-Message-State: APjAAAXrg57UaFmK+d1AClkpQoDaU3KPcg+cI4oehiTRpP7t8aBlCkHq UFhYHYAfRKdNAY9FQA4gley7vbUzTwIcumF7cEI= X-Google-Smtp-Source: APXvYqwB6fnAGAL0seJZwX3DDGctakNitxRyLcF6ksoA7px1tqfMVu1s4hTU4SAXPnlE2HOVZEztCg1xG9iR6urgqng= X-Received: by 2002:a67:e3c2:: with SMTP id k2mr8720020vsm.77.1567933155692; Sun, 08 Sep 2019 01:59:15 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Sebastian Gniazdowski Date: Sun, 8 Sep 2019 10:59:03 +0200 Message-ID: Subject: Re: Filtering array on index To: =?UTF-8?Q?Jesper_Nyg=C3=A5rds?= Cc: Zsh Users Content-Type: multipart/alternative; boundary="000000000000c6d2ea059206e29e" --000000000000c6d2ea059206e29e Content-Type: text/plain; charset="UTF-8" 23 July 2019, 09:42 Sebastian Gniazdowski wrote: > Turns out the expression can be simpler because the math mode within > array's index is implicit, so: > > idx=0; olen=$#a+1; a=( ${a[@]/(#m)*/$a[ ++idx % 2 ? olen : idx ]} ) > The expression can be even simpler if (valid in Zsh, just resolving to empty element when no ksharrays) index 0 will be used: idx=0; a=( ${a[@]/(#m)*/$a[ ++idx%2 ? 0 : idx ]} ) --000000000000c6d2ea059206e29e--