Hank Cheah, Author at Code Dodle

How to Use TeeReader in Golang

Hank Cheah — Sat, 06 May 2023 02:08:07 +0000

TeeReader is reader that writes to a writer, w, as you read from reader, r. It is useful for situations where you need to read a reader multiple times. As you know, readers such as bytes.Buffer can be read one time only. This is the official io.TeeReader definition:- func TeeReader(r Reader, w Writer) Reader This is...

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How to Slice a String in Golang [4 Examples]

Hank Cheah — Sun, 18 Dec 2022 04:49:26 +0000

In one of the earlier tutorials, I shared with you how you can break up a string into a slice of substrings. But what if your goal is just to extract a single substring from the source string? In this case, you might want to use slicing instead. Here’s the general syntax:- string_name[<inclusive start index>:<exclusive...

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How to Redirect HTTP URL to Email (mailto) and Phone (tel) using Golang

Hank Cheah — Fri, 16 Dec 2022 08:11:34 +0000

Here are two ways to redirect an URL to an email address (mailto:) or a phone number (tel:). 1. Using http.Redirect The Redirect function from the http package redirects from one URL to another. To use this function to redirect to a mailto: URL, just call the function from the handler that processes the original/source...

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How to Create a Reverse Proxy using Golang

Hank Cheah — Wed, 09 Nov 2022 08:47:24 +0000

Go’s httputil package makes it really easy to create a reverse proxy. In this article, I’ll show you how to create a simple reverse proxy and ways you can extend and develop more complex features using it as the base. Simple Reverse Proxy using httputil The simplest version of Go reverse proxy requires just a...

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How to Convert String to Slice of Characters in Go

Hank Cheah — Wed, 02 Nov 2022 10:07:11 +0000

In this article, I’ll share with you a few ways to break a string into characters in Go: Using strings.Split() Using rune() – this is my preferred approach Using byte() 1. Break String into Character Substrings using strings.Split() Given a string and a delimiter, strings.Split() slices the string into a slice of substrings. When the...

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How to Compare Strings in Go

Hank Cheah — Tue, 01 Nov 2022 12:44:56 +0000

There are two ways to compare strings lexicographically in Go:- 1. Use built-in comparison operators (officially recommended – more details below) 2. Use strings.Compare() Compare Two Strings using Comparision Operators In addition to numbers, Go comparison operators such as ==, >, >=, <, <= also supports strings. This is the officially recommended way to do...

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4 Ways to Split String into Subtrings in Go

Hank Cheah — Thu, 27 Oct 2022 12:40:11 +0000

In this tutorial, I’ll share with you four ways to split a string into a slice of substrings in Go. We’ll be using these 4 functions from Go’s strings package for the slicing task:- func Split(s, sep string) []string func SplitN(s, sep string, n int) []string func SplitAfter(s, sep string) []string func SplitAfterN(s, sep string,...

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WP-CLI Regenerate Thumbnails for Featured Images

Hank Cheah — Sat, 02 Jul 2022 13:52:28 +0000

Here’s the WP-CLI command I used to regenerate thumbnails for featured images:- wp db query "SELECT meta_value FROM wp_postmeta WHERE meta_key='_thumbnail_id'" --skip-column-names --silent | tr '\n' ' ' | xargs wp media regenerate Explaining The WP CLI Command There are three parts to this command, first we have wp db query "SELECT meta_value FROM wp_postmeta...

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Loop Through Only Even/Odd Indices of An Array

Hank Cheah — Sat, 25 Jun 2022 08:07:16 +0000

Suppose you’re given an array and you’re only interested in elements at either even or odd indices. How can you construct a loop to handle this situation? For example, given an array, letters = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’, ‘g’, ‘h’] Its corresponding indices are [0, 1, 2, 3, 4, 5, 6, 7] We’re...

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Bulk Convert All JPEGs and PNGs to WebPs using cwebp

Hank Cheah — Wed, 22 Jun 2022 05:16:27 +0000

I’m currently in the process of adding WebP support for my WordPress sites and one of the tasks involved is converting all existing images (JPEGs and PNGs) to WebP in bulk. To do that, we’ll be stringing together the find command, xargs, and cwebp. OS: Ubuntu 20.04. Host: Digital Ocean. To save you some time,...

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