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@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
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For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
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_1532 TILs and counting..._
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_1534 TILs and counting..._
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---
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@@ -408,6 +408,7 @@ _1532 TILs and counting..._
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- [Parse Flags From CLI Arguments](go/parse-flags-from-cli-arguments.md)
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- [Replace The Current Process With An External Command](go/replace-the-current-process-with-an-external-command.md)
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- [Sleep For A Duration](go/sleep-for-a-duration.md)
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- [Sort Slice In Ascending Or Descending Order](go/sort-slice-in-ascending-or-descending-order.md)
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- [Upgrading From An Older Version On Mac](go/upgrading-from-an-older-version-on-mac.md)
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### GROQ
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@@ -1223,6 +1224,7 @@ _1532 TILs and counting..._
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- [Define Multiline Strings With Heredocs](ruby/define-multiline-strings-with-heredocs.md)
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- [Destructure The First Item From An Array](ruby/destructure-the-first-item-from-an-array.md)
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- [Destructuring Arrays In Blocks](ruby/destructuring-arrays-in-blocks.md)
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- [Disable Interpolation For A Heredoc String](ruby/disable-interpolation-for-a-heredoc-string.md)
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- [Disassemble Some Codes](ruby/disassemble-some-codes.md)
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- [Double Splat To Merge Hashes](ruby/double-splat-to-merge-hashes.md)
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- [Edit Previous Parts Of The Pry Buffer History](ruby/edit-previous-parts-of-the-pry-buffer-history.md)
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52
go/sort-slice-in-ascending-or-descending-order.md
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52
go/sort-slice-in-ascending-or-descending-order.md
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# Sort Slice In Ascending Or Descending Order
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The [`slices.Sort`](https://pkg.go.dev/slices#Sort) function defaults to
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sorting a slice in ascending order. If we want to control the sort order, we
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have to do a little more work. We can reach for the
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[`slices.SortFunc`](https://pkg.go.dev/slices#SortFunc) function. This allows
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us to define a sort function and in that function we can control whether the
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sort order is ascending or descending.
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Here I've defined `SortItems` which takes a list of items constrained by the
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[`cmp.Ordered`](https://pkg.go.dev/cmp#Ordered) interface (so things like
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`int`, `string`, `uint64`, etc.). It takes a direction (`ASC` or `DESC`) as a
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second argument. It does the directional sort based on that second argument.
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```go
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import (
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"cmp"
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"fmt"
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"slices"
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)
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type Direction int
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const (
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ASC Direction = iota
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DESC
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)
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func SortItems[T cmp.Ordered](items []T, dir Direction) {
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slices.SortFunc(items, func(i, j T) int {
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if dir == ASC {
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return cmp.Compare(i, j)
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} else if dir == DESC {
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return cmp.Compare(j, i)
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} else {
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panic(fmt.Sprintf("Unrecognized sort direction: %d", dir))
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}
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})
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}
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// items := []int{3,2,8,1}
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// SortItems(items, ASC)
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// // items => [1,2,3,8]
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// SortItems(items, DESC)
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// // items => [8,3,2,1]
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```
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Because `slices.SortFunc` expects a negative value, zero, or positive value to
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determine the sort order, we use
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[`cmp.Compare`](https://pkg.go.dev/cmp#Compare) which returns those kinds of
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values. For ascending, we compare `i` to `j`. For descending, we swap them,
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comparing `j` to `i` to get the reverse sort order.
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@@ -5,6 +5,8 @@ an array-like object with all of the arguments to the function. Even if not
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all of the arguments are referenced in the function signature, they can
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still be accessed via the `arguments` object.
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> For ES6+ compatibility, the `spread` operator used via [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters) is preferred over the `arugments` object when accessing an abritrary number of function arguments.
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```javascript
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function argTest(one) {
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console.log(one);
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41
ruby/disable-interpolation-for-a-heredoc-string.md
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ruby/disable-interpolation-for-a-heredoc-string.md
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# Disable Interpolation For A Heredoc String
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As a matter of convenience, a heredoc performs string interpolation by default.
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Here is an example of that.
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```ruby
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irb(main):087> word = 'taco'
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=> "taco"
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irb(main):088" puts <<-TEXT
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irb(main):089" I want to eat a #{word}!
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irb(main):090> TEXT
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I want to eat a taco!
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=> nil
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```
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A much less common scenario is that we don't want string interpolation to take
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place. For whatever reason, we want the exact string to be preserved. To
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achieve that, we can wrap the opening heredoc identifier in single quotes.
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As you can see, the `#{word}` portion is preserved.
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```ruby
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irb(main):091> word = 'taco'
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=> "taco"
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irb(main):092' puts <<-'TEXT'
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irb(main):093' I want to eat a #{word}!
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irb(main):094> TEXT
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I want to eat a #{word}!
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=> nil
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```
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This syntax puts the heredoc in single-quote mode. I left the IRB line preamble
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in for each codeblock so that you can see the difference. The first example
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(lines 88 and 89) shows the heredoc is double-quoted. The second example (lines
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92 and 93) shows the heredoc is single quoted.
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Note: the closing heredoc identifier (`TEXT` in this case) is not wrapped in
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single quotes, just the opening one.
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[source](https://ruby-doc.org/3.3.6/syntax/literals_rdoc.html#label-Here+Document+Literals)
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