docs: Revise and rework user-guide/expressions

docs/source/_build/API_REFERENCE_LINKS.yml

@@ -42,13 +42,19 @@ python:
   Expr.str:
     name: "str namespace"
     link: https://docs.pola.rs/api/python/stable/reference/expressions/string.html
+  Expr.arr:
+    name: "arr namespace"
+    link: https://docs.pola.rs/api/python/stable/reference/expressions/array.html
   element: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.element.html
   all: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.all.html
   exclude: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.exclude.html
   alias: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.alias.html
   prefix: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.name.prefix.html
   suffix: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.name.suffix.html
+  map: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.name.map.html
   n_unique: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.n_unique.html
+  unique: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.unique.html
+  unique_counts: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.unique_counts.html
   approx_n_unique: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.approx_n_unique.html
   when: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.when.html
   concat_list: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.concat_list.html
@@ -116,6 +122,7 @@ python:
     name: log
     link: https://numpy.org/doc/stable/reference/generated/numpy.log.html
     feature_flags: ['numpy']
+  List: https://docs.pola.rs/api/python/stable/reference/api/polars.datatypes.List.html
   Array: https://docs.pola.rs/api/python/stable/reference/api/polars.datatypes.Array.html
   Series.arr: https://docs.pola.rs/api/python/stable/reference/series/array.html
   Series.dt.day: https://docs.pola.rs/api/python/stable/reference/series/api/polars.Series.dt.day.html
@@ -155,6 +162,8 @@ python:
   str.to_date: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.str.to_date.html
   str.len_chars: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.str.len_chars.html
   str.len_bytes: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.str.len_bytes.html
+  str.head: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.str.head.html
+  str.tail: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.str.tail.html
 
   struct.field: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.struct.field.html
   struct.rename_fields: https://docs.pola.rs/api/python/stable/reference/expressions/api/polars.Expr.struct.rename_fields.html
@@ -193,7 +202,11 @@ rust:
 
   operators: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/enum.Operator.html
 
-  Array: https://docs.pola.rs/api/rust/dev/polars/datatypes/enum.DataType.html#variant.Array
+  List: https://docs.pola.rs/api/rust/dev/polars/datatypes/enum.DataType.html#variant.List
+  Array:
+    name: Array
+    link: https://docs.pola.rs/api/rust/dev/polars/datatypes/enum.DataType.html#variant.Array
+    feature_flags: [dtype-array]
 
   DataFrame.explode: https://docs.pola.rs/api/rust/dev/polars/frame/struct.DataFrame.html#method.explode
   pivot: https://docs.pola.rs/api/rust/dev/polars_lazy/frame/pivot/fn.pivot.html
@@ -313,6 +326,11 @@ rust:
   fill_nan: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/enum.Expr.html#method.fill_nan
   fill_null: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/enum.Expr.html#method.fill_null
   n_unique: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/enum.Expr.html#method.n_unique
+  unique: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/enum.Expr.html#method.unique
+  unique_counts:
+    name: unique_counts
+    link: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/enum.Expr.html#method.unique_counts
+    feature_flags: ['unique_counts']
   null_count: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/enum.Expr.html#method.null_count
   interpolate: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/enum.Expr.html#method.interpolate
   is_between:
@@ -333,6 +351,10 @@ rust:
     name: "str namespace"
     link: https://docs.pola.rs/api/rust/dev/polars/prelude/trait.StringNameSpaceImpl.html
     feature_flags: [strings]
+  Expr.arr:
+    name: "`arr` namespace"
+    link: https://docs.pola.rs/api/rust/dev/polars/prelude/enum.Expr.html#method.arr
+    feature_flags: [dtype-array]
   Series.arr: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/struct.ArrayNameSpace.html
 
   date_range:
@@ -377,6 +399,12 @@ rust:
     name: str.contains
     link: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/string/struct.StringNameSpace.html#method.contains
     feature_flags: [regex]
+  str.head:
+    name: str.head
+    link: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/string/struct.StringNameSpace.html#method.head
+  str.tail:
+    name: str.tail
+    link: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/string/struct.StringNameSpace.html#method.tail
   str.extract:
     name: str.extract
     link: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/string/struct.StringNameSpace.html#method.extract
@@ -420,6 +448,9 @@ rust:
     name: "name namespace"
     link: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/struct.ExprNameNameSpace.html
     feature_flags: [lazy]
+  prefix: https://docs.rs/polars/latest/polars/prelude/struct.ExprNameNameSpace.html#method.prefix
+  suffix: https://docs.rs/polars/latest/polars/prelude/struct.ExprNameNameSpace.html#method.suffix
+  map: https://docs.rs/polars/latest/polars/prelude/struct.ExprNameNameSpace.html#method.map
   Expr.dt:
     name: "dt namespace"
     link: https://docs.pola.rs/api/rust/dev/polars_lazy/dsl/dt/struct.DateLikeNameSpace.html

docs/source/_build/css/extra.css

@@ -1,33 +1,35 @@
 :root {
-    --md-primary-fg-color:        #0B7189    ;
-    --md-primary-fg-color--light: #C2CCD6;
-    --md-primary-fg-color--dark:  #103547;
-    --md-text-font: 'Proxima Nova', sans-serif;
+  --md-primary-fg-color: #0B7189;
+  --md-primary-fg-color--light: #C2CCD6;
+  --md-primary-fg-color--dark: #103547;
+  --md-text-font: 'Proxima Nova', sans-serif;
 }
 
 
-span .md-typeset .emojione, .md-typeset .gemoji, .md-typeset .twemoji {
-    vertical-align: text-bottom;
+span .md-typeset .emojione,
+.md-typeset .gemoji,
+.md-typeset .twemoji {
+  vertical-align: text-bottom;
 }
 
 @font-face {
-    font-family: 'Proxima Nova', sans-serif;
-    src: 'https://fonts.cdnfonts.com/css/proxima-nova-2'
+  font-family: 'Proxima Nova', sans-serif;
+  src: 'https://fonts.cdnfonts.com/css/proxima-nova-2'
 }
 
 :root {
   --md-code-font: "Source Code Pro" !important;
 }
 
 .contributor_icon {
-    height:40px;
-    width:40px;
-    border-radius: 20px;
-    margin: 0 5px;
+  height: 40px;
+  width: 40px;
+  border-radius: 20px;
+  margin: 0 5px;
 }
 
-.feature-flag{
-  background-color: rgba(255, 245, 214,.5);
+.feature-flag {
+  background-color: rgba(255, 245, 214, .5);
   border: none;
   padding: 0px 5px;
   text-align: center;
@@ -38,27 +40,38 @@ span .md-typeset .emojione, .md-typeset .gemoji, .md-typeset .twemoji {
   font-size: .85em;
 }
 
-[data-md-color-scheme=slate] .feature-flag{
-  background-color:var(--md-code-bg-color);
+[data-md-color-scheme=slate] .feature-flag {
+  background-color: var(--md-code-bg-color);
 }
-.md-typeset ol li, .md-typeset ul li{
-    margin-bottom: 0em !important;
+
+.md-typeset ol li,
+.md-typeset ul li {
+  margin-bottom: 0em !important;
 }
 
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-  .md-typeset .rust > summary {
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-  .md-typeset .rust > summary::before {
-    background-color:rgb(205, 121, 44);
-    -webkit-mask-image: var(--md-admonition-icon--rust);
-            mask-image: var(--md-admonition-icon--rust);
-  }
+  --md-admonition-icon--rust: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3C!--! Font Awesome Free 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--%3E%3Cpath d='m508.52 249.75-21.82-13.51c-.17-2-.34-3.93-.55-5.88l18.72-17.5a7.35 7.35 0 0 0-2.44-12.25l-24-9c-.54-1.88-1.08-3.78-1.67-5.64l15-20.83a7.35 7.35 0 0 0-4.79-11.54l-25.42-4.15c-.9-1.73-1.79-3.45-2.73-5.15l10.68-23.42a7.35 7.35 0 0 0-6.95-10.39l-25.82.91q-1.79-2.22-3.61-4.4L439 81.84a7.36 7.36 0 0 0-8.84-8.84L405 78.93q-2.17-1.83-4.4-3.61l.91-25.82a7.35 7.35 0 0 0-10.39-7L367.7 53.23c-1.7-.94-3.43-1.84-5.15-2.73l-4.15-25.42a7.35 7.35 0 0 0-11.54-4.79L326 35.26c-1.86-.59-3.75-1.13-5.64-1.67l-9-24a7.35 7.35 0 0 0-12.25-2.44l-17.5 18.72c-1.95-.21-3.91-.38-5.88-.55L262.25 3.48a7.35 7.35 0 0 0-12.5 0L236.24 25.3c-2 .17-3.93.34-5.88.55l-17.5-18.72a7.35 7.35 0 0 0-12.25 2.44l-9 24c-1.89.55-3.79 1.08-5.66 1.68l-20.82-15a7.35 7.35 0 0 0-11.54 4.79l-4.15 25.41c-1.73.9-3.45 1.79-5.16 2.73l-23.4-10.63a7.35 7.35 0 0 0-10.39 7l.92 25.81c-1.49 1.19-3 2.39-4.42 3.61L81.84 73A7.36 7.36 0 0 0 73 81.84L78.93 107c-1.23 1.45-2.43 2.93-3.62 4.41l-25.81-.91a7.42 7.42 0 0 0-6.37 3.26 7.35 7.35 0 0 0-.57 7.13l10.66 23.41c-.94 1.7-1.83 3.43-2.73 5.16l-25.41 4.14a7.35 7.35 0 0 0-4.79 11.54l15 20.82c-.59 1.87-1.13 3.77-1.68 5.66l-24 9a7.35 7.35 0 0 0-2.44 12.25l18.72 17.5c-.21 1.95-.38 3.91-.55 5.88l-21.86 13.5a7.35 7.35 0 0 0 0 12.5l21.82 13.51c.17 2 .34 3.92.55 5.87l-18.72 17.5a7.35 7.35 0 0 0 2.44 12.25l24 9c.55 1.89 1.08 3.78 1.68 5.65l-15 20.83a7.35 7.35 0 0 0 4.79 11.54l25.42 4.15c.9 1.72 1.79 3.45 2.73 5.14l-10.63 23.43a7.35 7.35 0 0 0 .57 7.13 7.13 7.13 0 0 0 6.37 3.26l25.83-.91q1.77 2.22 3.6 4.4L73 430.16a7.36 7.36 0 0 0 8.84 8.84l25.16-5.93q2.18 1.83 4.41 3.61l-.92 25.82a7.35 7.35 0 0 0 10.39 6.95l23.43-10.68c1.69.94 3.42 1.83 5.14 2.73l4.15 25.42a7.34 7.34 0 0 0 11.54 4.78l20.83-15c1.86.6 3.76 1.13 5.65 1.68l9 24a7.36 7.36 0 0 0 12.25 2.44l17.5-18.72c1.95.21 3.92.38 5.88.55l13.51 21.82a7.35 7.35 0 0 0 12.5 0l13.51-21.82c2-.17 3.93-.34 5.88-.56l17.5 18.73a7.36 7.36 0 0 0 12.25-2.44l9-24c1.89-.55 3.78-1.08 5.65-1.68l20.82 15a7.34 7.34 0 0 0 11.54-4.78l4.15-25.42c1.72-.9 3.45-1.79 5.15-2.73l23.42 10.68a7.35 7.35 0 0 0 10.39-6.95l-.91-25.82q2.22-1.79 4.4-3.61l25.15 5.93a7.36 7.36 0 0 0 8.84-8.84L433.07 405q1.83-2.17 3.61-4.4l25.82.91a7.23 7.23 0 0 0 6.37-3.26 7.35 7.35 0 0 0 .58-7.13l-10.68-23.42c.94-1.7 1.83-3.43 2.73-5.15l25.42-4.15a7.35 7.35 0 0 0 4.79-11.54l-15-20.83c.59-1.87 1.13-3.76 1.67-5.65l24-9a7.35 7.35 0 0 0 2.44-12.25l-18.72-17.5c.21-1.95.38-3.91.55-5.87l21.82-13.51a7.35 7.35 0 0 0 0-12.5Zm-151 129.08A13.91 13.91 0 0 0 341 389.51l-7.64 35.67a187.51 187.51 0 0 1-156.36-.74l-7.64-35.66a13.87 13.87 0 0 0-16.46-10.68l-31.51 6.76a187.38 187.38 0 0 1-16.26-19.21H258.3c1.72 0 2.89-.29 2.89-1.91v-54.19c0-1.57-1.17-1.91-2.89-1.91h-44.83l.05-34.35H262c4.41 0 23.66 1.28 29.79 25.87 1.91 7.55 6.17 32.14 9.06 40 2.89 8.82 14.6 26.46 27.1 26.46H407a187.3 187.3 0 0 1-17.34 20.09Zm25.77 34.49A15.24 15.24 0 1 1 368 398.08h.44a15.23 15.23 0 0 1 14.8 15.24Zm-225.62-.68a15.24 15.24 0 1 1-15.25-15.25h.45a15.25 15.25 0 0 1 14.75 15.25Zm-88.1-178.49 32.83-14.6a13.88 13.88 0 0 0 7.06-18.33L102.69 186h26.56v119.73h-53.6a187.65 187.65 0 0 1-6.08-71.58Zm-11.26-36.06a15.24 15.24 0 0 1 15.23-15.25H74a15.24 15.24 0 1 1-15.67 15.24Zm155.16 24.49.05-35.32h63.26c3.28 0 23.07 3.77 23.07 18.62 0 12.29-15.19 16.7-27.68 16.7ZM399 306.71c-9.8 1.13-20.63-4.12-22-10.09-5.78-32.49-15.39-39.4-30.57-51.4 18.86-11.95 38.46-29.64 38.46-53.26 0-25.52-17.49-41.59-29.4-49.48-16.76-11-35.28-13.23-40.27-13.23h-198.9a187.49 187.49 0 0 1 104.89-59.19l23.47 24.6a13.82 13.82 0 0 0 19.6.44l26.26-25a187.51 187.51 0 0 1 128.37 91.43l-18 40.57a14 14 0 0 0 7.09 18.33l34.59 15.33a187.12 187.12 0 0 1 .4 32.54h-19.28c-1.91 0-2.69 1.27-2.69 3.13v8.82C421 301 409.31 305.58 399 306.71ZM240 60.21A15.24 15.24 0 0 1 255.21 45h.45A15.24 15.24 0 1 1 240 60.21ZM436.84 214a15.24 15.24 0 1 1 0-30.48h.44a15.24 15.24 0 0 1-.44 30.48Z'/%3E%3C/svg%3E");
+}
+
+.md-typeset .admonition.rust,
+.md-typeset details.rust {
+  border-color: rgb(205, 121, 44);
+}
+
+.md-typeset .rust>.admonition-title,
+.md-typeset .rust>summary {
+  background-color: rgb(205, 121, 44, .1);
+}
+
+.md-typeset .rust>.admonition-title::before,
+.md-typeset .rust>summary::before {
+  background-color: rgb(205, 121, 44);
+  -webkit-mask-image: var(--md-admonition-icon--rust);
+  mask-image: var(--md-admonition-icon--rust);
+}
+
+/* Adapt Excalidraw diagrams to dark mode. */
+body[data-md-color-scheme="slate"] .excalidraw svg {
+  will-change: filter;
+  filter: invert(100%) hue-rotate(180deg);
+}

docs/source/_build/js/mathjax.js

@@ -0,0 +1,19 @@
+window.MathJax = {
+    tex: {
+        inlineMath: [["\\(", "\\)"]],
+        displayMath: [["\\[", "\\]"]],
+        processEscapes: true,
+        processEnvironments: true
+    },
+    options: {
+        ignoreHtmlClass: ".*|",
+        processHtmlClass: "arithmatex"
+    }
+};
+
+document$.subscribe(() => {
+    MathJax.startup.output.clearCache()
+    MathJax.typesetClear()
+    MathJax.texReset()
+    MathJax.typesetPromise()
+})