BiteSizedChunks.comLearn one small thing at a time.

Courses Suggested Paths Pricing

Course contentsShowHide

124Integer literal suffixes and separators
125Hex, octal, and binary literals
126Byte literals and byte strings
127Raw string literals
128C string literals
129Float literal forms
130Integer overflow in debug vs release
131char as a Unicode scalar value
132Never type !
133Unit type ()
134usize and isize pointer-sized integers
135i128 and u128
136f32 vs f64 precision
137NaN and infinity semantics
138Numeric casts with as
139Saturating float to int casts
140Truncating casts and sign extension
141From and Into numeric conversions
142TryFrom for fallible numeric conversion
143Parsing numbers with FromStr
144Literal type inference and defaults
145Integer checked_add
146Integer checked_sub
147Integer checked_mul
148Integer checked_div
149Integer checked_pow
150Integer wrapping_add
151Integer wrapping_sub
152Integer wrapping_mul
153Integer wrapping_neg
154Integer saturating_add
155Integer saturating_sub
156Integer saturating_mul
157Integer overflowing_add
158Integer overflowing_sub
159Integer overflowing_mul
160Integer abs_diff
161Integer pow
162Integer isqrt
163Integer ilog2
164Integer ilog10
165Integer rem_euclid
166Integer div_euclid
167Integer signum
168Integer count_ones
169Integer leading_zeros
170Integer trailing_zeros
171Integer rotate_left
172Integer rotate_right
173Integer swap_bytes
174Integer to_be_bytes
175Integer from_le_bytes
176Integer reverse_bits
177Integer is_power_of_two
178Integer next_power_of_two
179Integer midpoint
180Integer div_ceil
181Integer next_multiple_of
182Integer unsigned_abs
183Integer MAX and MIN constants
184Float floor
185Float ceil
186Float round
187Float trunc
188Float fract
189Float abs
190Float signum
191Float sqrt
192Float powi
193Float powf
194Float exp
195Float ln
196Float log10
197Float sin
198Float cos
199Float tan
200Float atan2
201Float hypot
202Float mul_add
203Float clamp
204Float min
205Float max
206Float total_cmp
207Float to_bits
208Float from_bits
209Float is_nan
210Float is_finite
211Float EPSILON
212Float copysign
213Float rem_euclid
214Float to_degrees
215Float to_radians
216Comparing floats safely
217Ordering floats with total_cmp
218Why f64 is not Ord or Eq
219Wrapping floats with ordered-float
220const items and const expressions
221static items and their lifetime
222static mut and why it is discouraged
223Constants vs statics: inlining and addresses
224Let-else statements
225Deferred initialization of let bindings
226Destructuring in let
227Nested destructuring of structs and tuples
228Ignoring values with _ and ..
229Variable scoping and block expressions
230Labeled blocks with break values
231Underscore-prefixed names
232Name shadowing in match arms
233Inline const blocks
234Thread-local statics with thread_local!
235Statics with interior mutability
236Tuple indexing and nesting
237Tuple comparison and ordering
238Arrays of fixed size
239Array initialization with repeat expressions
240Array of arrays and multidimensional data
241Const generic array parameters
242Array iteration by value
243Array map and from_fn
244Array destructuring patterns
245Array to slice coercion
246Array try_from slice
247Arrays and Default
248Array equality and Debug limits
249chunks_exact and array_chunks on slices
250Windows over arrays
251Sorting arrays in place
252Binary search on sorted arrays
253Loop labels and nested breaks
254break with a value from loop
255while let with stacks
256for loops and IntoIterator desugaring
257Inclusive and exclusive ranges
258RangeBounds trait
259Step-by pattern with step_by
260Reverse iteration
261if let chains
262let chains in edition 2024
263Early return and guard clauses
264The ? operator in loops
265Diverging expressions
266Exhaustiveness checking
267match ergonomics and default binding modes
268Binding modes: ref and ref mut
269Match guards
270@ bindings in patterns
271Or-patterns
272Range patterns
273Slice patterns
274Constant patterns
275Struct patterns with shorthand
276Box patterns and deref patterns
277matches! macro
278Irrefutable vs refutable patterns
279Pattern matching on references
280Matching on strings and byte slices
281Matching tuples of enums
282Function pointers fn types
283Functions as arguments
284Returning functions
285Const functions with const fn
286Closures: capture by reference
287Closures: capture by move
288Fn, FnMut, FnOnce traits
289Closure capture disjoint fields in 2021
290Returning closures with impl Fn
291Returning boxed closures
292Closures in structs
293Storing closures in a Vec
294Recursion and closures
295Higher-order functions
296Closure size and zero-cost abstraction
297Callbacks and event handlers
298Currying and partial application in Rust
299Memoization with closures
300Never-returning functions
301Diverging functions and panics
302Method syntax vs function syntax
303UFCS fully qualified syntax
304Variadic emulation with macros
305Default arguments emulation
306Named arguments via builder or struct
307The Rust ABI and extern fn
308#[inline] attributes and hints
309#[must_use] on functions
310#[track_caller]
311#[cold] and likely branches
312Inline modules with mod
313Modules in separate files
314mod.rs vs file naming
315Paths: absolute and relative
316use declarations and renaming with as
317Glob imports and their risks
318Nested use groups
319Re-exports with pub use
320pub(crate) visibility
321pub(super) and pub(in path)
322Private by default
323Struct field privacy
324Enum variant visibility
325The prelude and custom preludes
326extern crate and the 2018 path changes
327self, super, and crate keywords
328Module-level documentation
329Organizing a large crate layout
330Facade modules
331Item ordering conventions
332Sealed trait pattern
333Inherent impl across modules
334use in function scope
335Name resolution and namespaces
336Macro namespace and #[macro_use]
337str::len
338str::is_empty
339str::chars
340str::char_indices
341str::bytes
342str::lines
343str::split
344str::split_whitespace
345str::splitn
346str::rsplit
347str::split_once
348str::rsplit_once
349str::split_terminator
350str::split_at
351str::split_inclusive
352str::trim
353str::trim_start
354str::trim_end
355str::trim_matches
356str::strip_prefix
357str::strip_suffix
358str::starts_with
359str::ends_with
360str::contains
361str::find
362str::rfind
363str::matches
364str::match_indices
365str::replace
366str::replacen
367str::to_uppercase
368str::to_lowercase
369str::to_ascii_uppercase
370str::eq_ignore_ascii_case
371str::repeat
372str::parse
373str::is_char_boundary
374str::get
375str::from_utf8
376str::as_bytes
377str::escape_debug
378str::escape_default
379str::encode_utf16
380String::new
381String::with_capacity
382String::from_utf8
383String::from_utf8_lossy
384String::push
385String::push_str
386String::insert
387String::insert_str
388String::pop
389String::remove
390String::retain
391String::truncate
392String::clear
393String::drain
394String::replace_range
395String::extend
396String::capacity
397String::reserve
398String::shrink_to_fit
399String::into_bytes
400String::into_boxed_str
401String::leak
402String::split_off
403String::as_str
404String::from_iter
405UTF-8 encoding and byte offsets
406Slicing strings on char boundaries
407Grapheme clusters with unicode-segmentation
408Unicode normalization with unicode-normalization
409Cow<str> for borrowed-or-owned strings
410OsString and OsStr
411Path and PathBuf strings
412CString and CStr
413Formatting with format! and write!
414Format specifiers: width, precision, fill
415Debug vs Display formatting
416Pretty debug with {:#?}
417Named and positional format arguments
418Inline format args capture
419Implementing fmt::Display
420Implementing fmt::Debug manually
421debug_struct and debug_list helpers
422fmt::Write vs io::Write
423Formatting numbers: hex, binary, exponent
424The Formatter API: pad and alternate flag
425String concatenation costs
426Building strings with join and concat
427char methods: is_alphabetic, to_digit, from_u32
428ASCII-only types and checks
429Box<str> and Rc<str> and Arc<str>
430Small string optimization crates: smol_str and compact_str
431String interning
432Text wrapping with textwrap
433Case conversion with heck
434Edit distance with strsim

124Integer literal suffixes and separators
125Hex, octal, and binary literals
126Byte literals and byte strings
127Raw string literals
128C string literals
129Float literal forms
130Integer overflow in debug vs release
131char as a Unicode scalar value
132Never type !
133Unit type ()
134usize and isize pointer-sized integers
135i128 and u128
136f32 vs f64 precision
137NaN and infinity semantics
138Numeric casts with as
139Saturating float to int casts
140Truncating casts and sign extension
141From and Into numeric conversions
142TryFrom for fallible numeric conversion
143Parsing numbers with FromStr
144Literal type inference and defaults
145Integer checked_add
146Integer checked_sub
147Integer checked_mul
148Integer checked_div
149Integer checked_pow
150Integer wrapping_add
151Integer wrapping_sub
152Integer wrapping_mul
153Integer wrapping_neg
154Integer saturating_add
155Integer saturating_sub
156Integer saturating_mul
157Integer overflowing_add
158Integer overflowing_sub
159Integer overflowing_mul
160Integer abs_diff
161Integer pow
162Integer isqrt
163Integer ilog2
164Integer ilog10
165Integer rem_euclid
166Integer div_euclid
167Integer signum
168Integer count_ones
169Integer leading_zeros
170Integer trailing_zeros
171Integer rotate_left
172Integer rotate_right
173Integer swap_bytes
174Integer to_be_bytes
175Integer from_le_bytes
176Integer reverse_bits
177Integer is_power_of_two
178Integer next_power_of_two
179Integer midpoint
180Integer div_ceil
181Integer next_multiple_of
182Integer unsigned_abs
183Integer MAX and MIN constants
184Float floor
185Float ceil
186Float round
187Float trunc
188Float fract
189Float abs
190Float signum
191Float sqrt
192Float powi
193Float powf
194Float exp
195Float ln
196Float log10
197Float sin
198Float cos
199Float tan
200Float atan2
201Float hypot
202Float mul_add
203Float clamp
204Float min
205Float max
206Float total_cmp
207Float to_bits
208Float from_bits
209Float is_nan
210Float is_finite
211Float EPSILON
212Float copysign
213Float rem_euclid
214Float to_degrees
215Float to_radians
216Comparing floats safely
217Ordering floats with total_cmp
218Why f64 is not Ord or Eq
219Wrapping floats with ordered-float
220const items and const expressions
221static items and their lifetime
222static mut and why it is discouraged
223Constants vs statics: inlining and addresses
224Let-else statements
225Deferred initialization of let bindings
226Destructuring in let
227Nested destructuring of structs and tuples
228Ignoring values with _ and ..
229Variable scoping and block expressions
230Labeled blocks with break values
231Underscore-prefixed names
232Name shadowing in match arms
233Inline const blocks
234Thread-local statics with thread_local!
235Statics with interior mutability
236Tuple indexing and nesting
237Tuple comparison and ordering
238Arrays of fixed size
239Array initialization with repeat expressions
240Array of arrays and multidimensional data
241Const generic array parameters
242Array iteration by value
243Array map and from_fn
244Array destructuring patterns
245Array to slice coercion
246Array try_from slice
247Arrays and Default
248Array equality and Debug limits
249chunks_exact and array_chunks on slices
250Windows over arrays
251Sorting arrays in place
252Binary search on sorted arrays
253Loop labels and nested breaks
254break with a value from loop
255while let with stacks
256for loops and IntoIterator desugaring
257Inclusive and exclusive ranges
258RangeBounds trait
259Step-by pattern with step_by
260Reverse iteration
261if let chains
262let chains in edition 2024
263Early return and guard clauses
264The ? operator in loops
265Diverging expressions
266Exhaustiveness checking
267match ergonomics and default binding modes
268Binding modes: ref and ref mut
269Match guards
270@ bindings in patterns
271Or-patterns
272Range patterns
273Slice patterns
274Constant patterns
275Struct patterns with shorthand
276Box patterns and deref patterns
277matches! macro
278Irrefutable vs refutable patterns
279Pattern matching on references
280Matching on strings and byte slices
281Matching tuples of enums
282Function pointers fn types
283Functions as arguments
284Returning functions
285Const functions with const fn
286Closures: capture by reference
287Closures: capture by move
288Fn, FnMut, FnOnce traits
289Closure capture disjoint fields in 2021
290Returning closures with impl Fn
291Returning boxed closures
292Closures in structs
293Storing closures in a Vec
294Recursion and closures
295Higher-order functions
296Closure size and zero-cost abstraction
297Callbacks and event handlers
298Currying and partial application in Rust
299Memoization with closures
300Never-returning functions
301Diverging functions and panics
302Method syntax vs function syntax
303UFCS fully qualified syntax
304Variadic emulation with macros
305Default arguments emulation
306Named arguments via builder or struct
307The Rust ABI and extern fn
308#[inline] attributes and hints
309#[must_use] on functions
310#[track_caller]
311#[cold] and likely branches
312Inline modules with mod
313Modules in separate files
314mod.rs vs file naming
315Paths: absolute and relative
316use declarations and renaming with as
317Glob imports and their risks
318Nested use groups
319Re-exports with pub use
320pub(crate) visibility
321pub(super) and pub(in path)
322Private by default
323Struct field privacy
324Enum variant visibility
325The prelude and custom preludes
326extern crate and the 2018 path changes
327self, super, and crate keywords
328Module-level documentation
329Organizing a large crate layout
330Facade modules
331Item ordering conventions
332Sealed trait pattern
333Inherent impl across modules
334use in function scope
335Name resolution and namespaces
336Macro namespace and #[macro_use]
337str::len
338str::is_empty
339str::chars
340str::char_indices
341str::bytes
342str::lines
343str::split
344str::split_whitespace
345str::splitn
346str::rsplit
347str::split_once
348str::rsplit_once
349str::split_terminator
350str::split_at
351str::split_inclusive
352str::trim
353str::trim_start
354str::trim_end
355str::trim_matches
356str::strip_prefix
357str::strip_suffix
358str::starts_with
359str::ends_with
360str::contains
361str::find
362str::rfind
363str::matches
364str::match_indices
365str::replace
366str::replacen
367str::to_uppercase
368str::to_lowercase
369str::to_ascii_uppercase
370str::eq_ignore_ascii_case
371str::repeat
372str::parse
373str::is_char_boundary
374str::get
375str::from_utf8
376str::as_bytes
377str::escape_debug
378str::escape_default
379str::encode_utf16
380String::new
381String::with_capacity
382String::from_utf8
383String::from_utf8_lossy
384String::push
385String::push_str
386String::insert
387String::insert_str
388String::pop
389String::remove
390String::retain
391String::truncate
392String::clear
393String::drain
394String::replace_range
395String::extend
396String::capacity
397String::reserve
398String::shrink_to_fit
399String::into_bytes
400String::into_boxed_str
401String::leak
402String::split_off
403String::as_str
404String::from_iter
405UTF-8 encoding and byte offsets
406Slicing strings on char boundaries
407Grapheme clusters with unicode-segmentation
408Unicode normalization with unicode-normalization
409Cow<str> for borrowed-or-owned strings
410OsString and OsStr
411Path and PathBuf strings
412CString and CStr
413Formatting with format! and write!
414Format specifiers: width, precision, fill
415Debug vs Display formatting
416Pretty debug with {:#?}
417Named and positional format arguments
418Inline format args capture
419Implementing fmt::Display
420Implementing fmt::Debug manually
421debug_struct and debug_list helpers
422fmt::Write vs io::Write
423Formatting numbers: hex, binary, exponent
424The Formatter API: pad and alternate flag
425String concatenation costs
426Building strings with join and concat
427char methods: is_alphabetic, to_digit, from_u32
428ASCII-only types and checks
429Box<str> and Rc<str> and Arc<str>
430Small string optimization crates: smol_str and compact_str
431String interning
432Text wrapping with textwrap
433Case conversion with heck
434Edit distance with strsim

Search the Rust glossary

Lesson 369 of 2,385·8. Core Language in DepthFree lesson

str::to_ascii_uppercase

Writing your lesson…

← Previous Next lesson →

© 2026 BiteSizedChunks.com. Learn one small thing at a time.

Glossary Contact Terms of Service Privacy Policy