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| Date post: | 22-May-2015 |
| Category: |
Technology |
| Upload: | techknowxpress |
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PERSPECTIVE
According to Greg Federighi, (Apple senior vice president for software engineering)
"Swift is fast, it is modern, it is designed for safety, and it enables a level of interactivity and development that you've never seen before on the platform."
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SWIFT & ITS PURPOSE
To make development of apps for Apple's mobile platform easier.
To unify the procedural and object-oriented portions of the language.
Improve performance of App by removing baggage's of legacy language
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TECHNICAL SPECIFICATION
Xcode V6 beta offers development platform for Swift
Xcode V6 beta is compatible on MAC OS X 10.9.3 and above
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FEATURES OF SWIFT
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COMPARISON
Objective-C is a hard language to pick up for new developers.
Swift makes getting started with app development on Apple’s platforms easier.
Swift feels more accessible than Objective-C.
Swift is 3.9 times faster while objective-C is 2.8 times faster than python.
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LEXICAL STRUCTURE
The lexical structure of Swift describes what sequence of characters form valid tokens of the language.
These valid tokens form the lowest-level building blocks of the language.
They are used to describe the rest of the language.
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GRAMMAR
Grammar
Statements
declarations
patterns
attributes
expressions
types
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GRAMMAR OF SWIFT
Grammar
STATEMENTS
declarations
patterns
attributes
expressions
types
expressionopt
declarationopt
loop-statementopt
branch-statementopt
labelled-statement
control-transfer-statementopt
statement statementsopt
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GRAMMAR OF DECLARATION
Grammar
statements
DECLARATIONS
patterns
attributes
expressions
types
import constant variable typealias function enum struct
class
protocol
initializer
deinitializer
extension
subscript
operator
declaration declarationsopt
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GRAMMAR OF PATTERN
Grammar
Statements
declarations
PATTERNS
attributes
expressions
types
wildcard-pattern type-annotationopt
identifier-pattern type-annotationopt
value-binding-pattern
tuple-pattern type-annotationopt
enum-case-pattern
type-casting-pattern
expression-pattern
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GRAMMAR OF ATTRIBUTES
Grammar
statements
declarations
patterns
ATTRIBUTES
expressions
typesAttribute :-@ attribute-
name attribute-argument-clauseopt
Attribute-name :- identifier
Attribute-argument-clause :-(balanced-tokensopt)
Attributes :-attribute attributesopt
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GRAMMAR OF EXPRESSIONS
Grammar
statements
declarations
patterns
attributes
EXPRESSIONS
types
Expression:-prefix-expression binary-expressionsopt
Expression List:-expression|expression , expression-list
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GRAMMAR OF TYPES
Grammar
statements
declarations
patterns
attributes
expressions
TYPES •array-type •function-type•type-identifier•tuple-type•optional-type•implicitly-unwrapped-optional-type•protocol-composition-type•metatype-type
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REFERENCES
For more information:◦Apple has released a guidebook for the
language in iBooks Store. ◦InfoWorld.com
