diff --git a/crates/nu-command/src/platform/dir_info.rs b/crates/nu-command/src/platform/dir_info.rs
index d96e43403b3..2ff0587bb2e 100644
--- a/crates/nu-command/src/platform/dir_info.rs
+++ b/crates/nu-command/src/platform/dir_info.rs
@@ -159,14 +159,11 @@ impl DirInfo {
 
     fn add_file(mut self, f: impl Into<PathBuf>, params: &DirBuilder) -> Self {
         let f = f.into();
-        let include = params
-            .exclude
-            .as_ref()
-            .map_or(true, |x| !x.matches_path(&f));
+        let include = params.exclude.as_ref().is_none_or(|x| !x.matches_path(&f));
         if include {
             match FileInfo::new(f, params.deref, self.tag, self.long) {
                 Ok(file) => {
-                    let inc = params.min.map_or(true, |s| file.size >= s);
+                    let inc = params.min.is_none_or(|s| file.size >= s);
                     if inc {
                         self.size += file.size;
                         self.blocks += file.blocks.unwrap_or(0);
diff --git a/crates/nu-explore/src/views/try.rs b/crates/nu-explore/src/views/try.rs
index a5560735fe5..518cb181cd0 100644
--- a/crates/nu-explore/src/views/try.rs
+++ b/crates/nu-explore/src/views/try.rs
@@ -238,7 +238,7 @@ impl View for TryView {
     }
 
     fn show_data(&mut self, i: usize) -> bool {
-        self.table.as_mut().map_or(false, |v| v.show_data(i))
+        self.table.as_mut().is_some_and(|v| v.show_data(i))
     }
 }
 
diff --git a/crates/nu-json/src/de.rs b/crates/nu-json/src/de.rs
index d3edf86d3bd..43a5174ff17 100644
--- a/crates/nu-json/src/de.rs
+++ b/crates/nu-json/src/de.rs
@@ -457,7 +457,7 @@ where
                                             .error(ErrorCode::LoneLeadingSurrogateInHexEscape));
                                     }
 
-                                    let n = (((n1 - 0xD800) as u32) << 10 | (n2 - 0xDC00) as u32)
+                                    let n = ((((n1 - 0xD800) as u32) << 10) | (n2 - 0xDC00) as u32)
                                         + 0x1_0000;
 
                                     match char::from_u32(n) {
diff --git a/crates/nu-json/src/ser.rs b/crates/nu-json/src/ser.rs
index 6d8f39a647f..85a00d45161 100644
--- a/crates/nu-json/src/ser.rs
+++ b/crates/nu-json/src/ser.rs
@@ -142,25 +142,23 @@ where
     fn serialize_f32(self, value: f32) -> Result<()> {
         self.formatter.start_value(&mut self.writer)?;
         fmt_f32_or_null(&mut self.writer, if value == -0f32 { 0f32 } else { value })
-            .map_err(From::from)
     }
 
     #[inline]
     fn serialize_f64(self, value: f64) -> Result<()> {
         self.formatter.start_value(&mut self.writer)?;
         fmt_f64_or_null(&mut self.writer, if value == -0f64 { 0f64 } else { value })
-            .map_err(From::from)
     }
 
     #[inline]
     fn serialize_char(self, value: char) -> Result<()> {
         self.formatter.start_value(&mut self.writer)?;
-        escape_char(&mut self.writer, value).map_err(From::from)
+        escape_char(&mut self.writer, value)
     }
 
     #[inline]
     fn serialize_str(self, value: &str) -> Result<()> {
-        quote_str(&mut self.writer, &mut self.formatter, value).map_err(From::from)
+        quote_str(&mut self.writer, &mut self.formatter, value)
     }
 
     #[inline]
@@ -496,7 +494,7 @@ where
 
     #[inline]
     fn serialize_str(self, value: &str) -> Result<()> {
-        escape_key(&mut self.ser.writer, value).map_err(From::from)
+        escape_key(&mut self.ser.writer, value)
     }
 
     type SerializeSeq = ser::Impossible<(), Error>;
@@ -853,7 +851,7 @@ pub fn escape_key<W>(wr: &mut W, value: &str) -> Result<()>
 where
     W: io::Write,
 {
-    escape_bytes(wr, value.as_bytes()).map_err(From::from)
+    escape_bytes(wr, value.as_bytes())
 }
 
 #[inline]
diff --git a/crates/nu-lsp/src/ast.rs b/crates/nu-lsp/src/ast.rs
index 91f11140608..5698d836d0e 100644
--- a/crates/nu-lsp/src/ast.rs
+++ b/crates/nu-lsp/src/ast.rs
@@ -57,7 +57,7 @@ fn try_find_id_in_def(
 ) -> Option<(Id, Span)> {
     let mut span = None;
     for arg in call.arguments.iter() {
-        if location.map_or(true, |pos| arg.span().contains(*pos)) {
+        if location.is_none_or(|pos| arg.span().contains(*pos)) {
             // String means this argument is the name
             if let Argument::Positional(expr) = arg {
                 if let Expr::String(_) = &expr.expr {
@@ -76,7 +76,7 @@ fn try_find_id_in_def(
     let name = working_set.get_span_contents(span);
     let decl_id = Id::Declaration(working_set.find_decl(name)?);
     id_ref
-        .map_or(true, |id_r| decl_id == *id_r)
+        .is_none_or(|id_r| decl_id == *id_r)
         .then_some((decl_id, span))
 }
 
@@ -96,7 +96,7 @@ fn try_find_id_in_mod(
     location: Option<&usize>,
     id_ref: Option<&Id>,
 ) -> Option<(Id, Span)> {
-    let check_location = |span: &Span| location.map_or(true, |pos| span.contains(*pos));
+    let check_location = |span: &Span| location.is_none_or(|pos| span.contains(*pos));
 
     call.arguments.first().and_then(|arg| {
         if !check_location(&arg.span()) {
@@ -109,7 +109,7 @@ fn try_find_id_in_mod(
                 let found_id = Id::Module(module_id);
                 let found_span = strip_quotes(arg.span(), working_set);
                 id_ref
-                    .map_or(true, |id_r| found_id == *id_r)
+                    .is_none_or(|id_r| found_id == *id_r)
                     .then_some((found_id, found_span))
             }
             _ => None,
@@ -152,7 +152,7 @@ fn try_find_id_in_use(
             .or(working_set.find_variable(name).map(Id::Variable)),
         _ => None,
     };
-    let check_location = |span: &Span| location.map_or(true, |pos| span.contains(*pos));
+    let check_location = |span: &Span| location.is_none_or(|pos| span.contains(*pos));
 
     // Get module id if required
     let module_name = call.arguments.first()?;
@@ -232,10 +232,10 @@ fn try_find_id_in_overlay(
     location: Option<&usize>,
     id: Option<&Id>,
 ) -> Option<(Id, Span)> {
-    let check_location = |span: &Span| location.map_or(true, |pos| span.contains(*pos));
+    let check_location = |span: &Span| location.is_none_or(|pos| span.contains(*pos));
     let module_from_overlay_name = |name: &str, span: Span| {
         let found_id = Id::Module(working_set.find_overlay(name.as_bytes())?.origin);
-        id.map_or(true, |id_r| found_id == *id_r)
+        id.is_none_or(|id_r| found_id == *id_r)
             .then_some((found_id, strip_quotes(span, working_set)))
     };
     for arg in call.arguments.iter() {
@@ -272,7 +272,7 @@ fn get_matched_module_id(
     let path = std::path::PathBuf::from(name.as_ref());
     let stem = path.file_stem().and_then(|fs| fs.to_str()).unwrap_or(&name);
     let found_id = Id::Module(working_set.find_module(stem.as_bytes())?);
-    id.map_or(true, |id_r| found_id == *id_r)
+    id.is_none_or(|id_r| found_id == *id_r)
         .then_some((found_id, span))
 }
 
diff --git a/crates/nu-parser/src/parser.rs b/crates/nu-parser/src/parser.rs
index 7c2b162c377..32ec9d3ce99 100644
--- a/crates/nu-parser/src/parser.rs
+++ b/crates/nu-parser/src/parser.rs
@@ -2817,7 +2817,7 @@ pub const DURATION_UNIT_GROUPS: &[UnitGroup] = &[
 fn modf(x: f64) -> (f64, f64) {
     let rv2: f64;
     let mut u = x.to_bits();
-    let e = ((u >> 52 & 0x7ff) as i32) - 0x3ff;
+    let e = (((u >> 52) & 0x7ff) as i32) - 0x3ff;
 
     /* no fractional part */
     if e >= 52 {
diff --git a/src/config_files.rs b/src/config_files.rs
index ca77113ae50..5c53d8f0826 100644
--- a/src/config_files.rs
+++ b/src/config_files.rs
@@ -247,7 +247,7 @@ pub(crate) fn setup_config(
         &config_file, &env_file, is_login_shell
     );
 
-    let create_scaffold = nu_path::nu_config_dir().map_or(false, |p| !p.exists());
+    let create_scaffold = nu_path::nu_config_dir().is_some_and(|p| !p.exists());
 
     let result = catch_unwind(AssertUnwindSafe(|| {
         #[cfg(feature = "plugin")]
diff --git a/src/run.rs b/src/run.rs
index fc3bca3676d..43ca28bb045 100644
--- a/src/run.rs
+++ b/src/run.rs
@@ -24,7 +24,7 @@ pub(crate) fn run_commands(
     trace!("run_commands");
 
     let start_time = std::time::Instant::now();
-    let create_scaffold = nu_path::nu_config_dir().map_or(false, |p| !p.exists());
+    let create_scaffold = nu_path::nu_config_dir().is_some_and(|p| !p.exists());
 
     // if the --no-config-file(-n) option is NOT passed, load the plugin file,
     // load the default env file or custom (depending on parsed_nu_cli_args.env_file),
@@ -54,7 +54,7 @@ pub(crate) fn run_commands(
         perf!("read env.nu", start_time, use_color);
 
         let start_time = std::time::Instant::now();
-        let create_scaffold = nu_path::nu_config_dir().map_or(false, |p| !p.exists());
+        let create_scaffold = nu_path::nu_config_dir().is_some_and(|p| !p.exists());
 
         // If we have a config file parameter *OR* we have a login shell parameter, read the config file
         if parsed_nu_cli_args.config_file.is_some() || parsed_nu_cli_args.login_shell.is_some() {
@@ -122,7 +122,7 @@ pub(crate) fn run_file(
     // if the --no-config-file(-n) flag is passed, do not load plugin, env, or config files
     if parsed_nu_cli_args.no_config_file.is_none() {
         let start_time = std::time::Instant::now();
-        let create_scaffold = nu_path::nu_config_dir().map_or(false, |p| !p.exists());
+        let create_scaffold = nu_path::nu_config_dir().is_some_and(|p| !p.exists());
         #[cfg(feature = "plugin")]
         read_plugin_file(engine_state, parsed_nu_cli_args.plugin_file);
         perf!("read plugins", start_time, use_color);