Swift Default Operators

swift-default-operators.md

Glyph	Code	Description
!	U+0021	EXCLAMATION MARK
%	U+0025	PERCENT SIGN
&	U+0026	AMPERSAND
*	U+002A	ASTERISK
+	U+002B	PLUS SIGN
-	U+002D	HYPHEN-MINUS
/	U+002F	SOLIDUS
<	U+003C	LESS-THAN SIGN
=	U+003D	EQUALS SIGN
>	U+003E	GREATER-THAN SIGN
?	U+003F	QUESTION MARK
^	U+005E	CIRCUMFLEX ACCENT
|	U+007C	VERTICAL LINE
~	U+007E	TILDE
¡	U+00A1	INVERTED EXCLAMATION MARK
§	U+00A7	SECTION SIGN
¬	U+00AC	NOT SIGN
±	U+00B1	PLUS-MINUS SIGN
¶	U+00B6	PILCROW SIGN
¿	U+00BF	INVERTED QUESTION MARK
×	U+00D7	MULTIPLICATION SIGN
÷	U+00F7	DIVISION SIGN
′	U+2032	PRIME
←	U+2190	LEFTWARDS ARROW
↑	U+2191	UPWARDS ARROW
→	U+2192	RIGHTWARDS ARROW
↓	U+2193	DOWNWARDS ARROW
↔	U+2194	LEFT RIGHT ARROW
↦	U+21A6	RIGHTWARDS ARROW FROM BAR
↼	U+21BC	LEFTWARDS HARPOON WITH BARB UPWARDS
↽	U+21BD	LEFTWARDS HARPOON WITH BARB DOWNWARDS
⇀	U+21C0	RIGHTWARDS HARPOON WITH BARB UPWARDS
⇁	U+21C1	RIGHTWARDS HARPOON WITH BARB DOWNWARDS
⇐	U+21D0	LEFTWARDS DOUBLE ARROW
⇑	U+21D1	UPWARDS DOUBLE ARROW
⇒	U+21D2	RIGHTWARDS DOUBLE ARROW
⇓	U+21D3	DOWNWARDS DOUBLE ARROW
⇔	U+21D4	LEFT RIGHT DOUBLE ARROW
∀	U+2200	FOR ALL
∃	U+2203	THERE EXISTS
∈	U+2208	ELEMENT OF
∋	U+220B	CONTAINS AS MEMBER
∏	U+220F	N-ARY PRODUCT
∐	U+2210	N-ARY COPRODUCT
∑	U+2211	N-ARY SUMMATION
∓	U+2213	MINUS-OR-PLUS SIGN
∘	U+2218	RING OPERATOR
∙	U+2219	BULLET OPERATOR
∝	U+221D	PROPORTIONAL TO
∠	U+2220	ANGLE
∥	U+2225	PARALLEL TO
∧	U+2227	LOGICAL AND
∨	U+2228	LOGICAL OR
∩	U+2229	INTERSECTION
∪	U+222A	UNION
∫	U+222B	INTEGRAL
∮	U+222E	CONTOUR INTEGRAL
∲	U+2232	CLOCKWISE CONTOUR INTEGRAL
∳	U+2233	ANTICLOCKWISE CONTOUR INTEGRAL
∴	U+2234	THEREFORE
∵	U+2235	BECAUSE
≀	U+2240	WREATH PRODUCT
≃	U+2243	ASYMPTOTICALLY EQUAL TO
≅	U+2245	APPROXIMATELY EQUAL TO
≈	U+2248	ALMOST EQUAL TO
≍	U+224D	EQUIVALENT TO
≐	U+2250	APPROACHES THE LIMIT
≠	U+2260	NOT EQUAL TO
≡	U+2261	IDENTICAL TO
≤	U+2264	LESS-THAN OR EQUAL TO
≥	U+2265	GREATER-THAN OR EQUAL TO
≪	U+226A	MUCH LESS-THAN
≫	U+226B	MUCH GREATER-THAN
≺	U+227A	PRECEDES
≻	U+227B	SUCCEEDS
≼	U+227C	PRECEDES OR EQUAL TO
≽	U+227D	SUCCEEDS OR EQUAL TO
⊂	U+2282	SUBSET OF
⊃	U+2283	SUPERSET OF
⊆	U+2286	SUBSET OF OR EQUAL TO
⊇	U+2287	SUPERSET OF OR EQUAL TO
⊎	U+228E	MULTISET UNION
⊑	U+2291	SQUARE IMAGE OF OR EQUAL TO
⊒	U+2292	SQUARE ORIGINAL OF OR EQUAL TO
⊓	U+2293	SQUARE CAP
⊔	U+2294	SQUARE CUP
⊕	U+2295	CIRCLED PLUS
⊖	U+2296	CIRCLED MINUS
⊗	U+2297	CIRCLED TIMES
⊘	U+2298	CIRCLED DIVISION SLASH
⊙	U+2299	CIRCLED DOT OPERATOR
⊢	U+22A2	RIGHT TACK
⊣	U+22A3	LEFT TACK
⊤	U+22A4	DOWN TACK
⊥	U+22A5	UP TACK
⊨	U+22A8	TRUE
⋄	U+22C4	DIAMOND OPERATOR
⋅	U+22C5	DOT OPERATOR
⋆	U+22C6	STAR OPERATOR
⋈	U+22C8	BOWTIE
⋮	U+22EE	VERTICAL ELLIPSIS
⋯	U+22EF	MIDLINE HORIZONTAL ELLIPSIS
⋰	U+22F0	UP RIGHT DIAGONAL ELLIPSIS
⋱	U+22F1	DOWN RIGHT DIAGONAL ELLIPSIS

Design Principles

• Preserve all existing ASCII operator characters.
• Include ¡ and ¿ to complement non-C Swift operators ! and ? (on-list request).
• Include § due to extant use in Operadics package and ¶ to complement that usage.
• Include NFKC non-operand characters given in UTN28, excluding enclosures, spaces, big/long variants, arrows that display as emoji on common platforms, and characters confusable with ASCII operator characters.
• Where two semantically equivalent characters would otherwise be listed, favor the "operator" equivalent as recommended by Unicode (e.g., BULLET OPERATOR over BULLET)--unless the "non-operator" equivalent is an ASCII character, as a pragmatic concession to backward compatibility (e.g., ASTERISK over ASTERISK OPERATOR).