Section 1
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logical AND
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Last updated
6 years ago
Date created
Mar 14, 2020
Cards (68)
Section 1
(50 cards)
logical AND
creates logical expressions where both values must be true for the overall expression to also be true.
Unary Minus Operator
The sign of a numeric value can be toggled using a prefixed -
closed range operator (a...b)
defines a range that runs from a to b, and includes the values a and b
logical operators
modify or combine the Boolean logic values true and false.
true
It is sometimes useful to include parentheses when they are not strictly needed, to make the intention of a complex expression easier to read.
range operators
shortcuts for expressing a range of values
Remainder (%)
works out how many multiples of b will fit inside a and returns the value that is left over (known as the remainder)
logical NOT
Inverts a Boolean value so that true becomes false, and false becomes true.
assignment operator (=)
operator does not return a value
logical OR
a||b
String interpolation
a way to construct a new String value from a mix of constants, variables, literals, and expressions by including their values inside a string literal.
a = a + 2
a += 2 shorthand for
Ternary
operate on three targets.
let
How do you declare a constant?
+=
How do you add to a mutable string?
horizontal tab
\t
value
Swift's String type is a _ type.
line feed
question ? answer1 : answer2
what are the three parts to a ternary conditional operator
ternary conditional operator
special operator with three parts
nil coalescing operator (a ?? b)
unwraps an optional a if it contains a value, or returns a default value b if a is nil. (name and implementation)
nil coalescing operator
a != nil ? a! : b what is the name of the shorthand for this
string literal
fixed sequence of textual characters surrounded by a pair of double quotes ("").
bool
comparison operators return a ___ value to indicate whether or not the statement is true
carriage return
\r
Compound Assignment Operators
combine assignment (=) with another operation
U0024
"\u{24}"
double quote
\"
unsigned
An integer that is positive or zero
Unicode
an international standard for encoding, representing, and processing text in different writing systems
half-open range operator (a..<b)
defines a range that runs from a to b, but does not include b.
identity operators
to test whether two object references both refer to the same object instance.
logical AND
a&&b
logical NOT
!a
single quote
\'
characters
ou can access the individual Character values for a String by iterating over its _ property
ternary conditional operator
question ? answer1 : answer2
Unicode Scalars
a unique 21-bit number for a character or modifier, such as U+0061 for LATIN SMALL LETTER A ("a"), or U+1F425 for FRONT-FACING BABY CHICK ("🐥").
null character
\0
logical OR
You use it to create logical expressions in which only one of the two values has to be true for the overall expression to be true.
Binary
operators operate on two targets (such as 2 + 3)
operator
special symbol or phrase that you use to check, change, or combine values.
;
How do you write multiple statements on a single line?
+
String values can be added together (or concatenated) with the addition operator (___) to create a new String value:
Unary
operators operate on a single target (such as -a)
"\u{24}"
U0024
backslash
\\
var
How do you declare a variable?
.isEmpty
How do you see if a String is empty?
signed
An integer that is either positive, negative or zero is a _ integer.
Section 2
(18 cards)