tayloraswift

Stop converting Data to String

Operating on [UInt8] text buffers (“bytestrings”) is a common programming task. A popular approach among some Swift users is to (ab)use the String API, and attempt to spell familiar C-idioms using its syntax. This has the major bonus of readability, but leaves users vulnerable to many pitfalls.

A common mistake is to convert bytestrings to Strings and compare them to other Strings. Given two bytestrings a:[UInt8], b:[UInt8], many users assume that

String(decoding: a, as: Unicode.ASCII.self) == 
String(decoding: b, as: Unicode.ASCII.self)

tayloraswift

Vector manifesto

Vectors, understood as 2, 3, or 4-component numerical aggregates, are a fundamental currency type across many domains of programming. This document seeks to lay out a cohesive vision for adding standard vector support to the Swift language, with consideration for relevant long-term goals for the language type system.

Past discussions: 1 2, 3, 4, 5

Past pitches: 1

Vectors and fixed-size arrays

tayloraswift

import func Glibc.sin
import func Glibc.cos
import func Glibc.tan
import func Glibc.asin
import func Glibc.acos
import func Glibc.atan
import func Glibc.atan2

infix operator <> :MultiplicationPrecedence // dot product
infix operator >< :MultiplicationPrecedence // cross product

tayloraswift

import func Glibc.atan2

infix operator <> :MultiplicationPrecedence // dot product
infix operator >< :MultiplicationPrecedence // cross product
infix operator &<> :MultiplicationPrecedence // wrapping dot product
infix operator &>< :MultiplicationPrecedence // wrapping cross product

infix operator ~~ :ComparisonPrecedence     // distance test 
infix operator !~ :ComparisonPrecedence     // distance test 

tayloraswift

import sys 

text = sys.argv[1]

def hue(angle):
    h = angle / 60
    x = 1 - abs(h % 2 - 1)
    return ((1, x, 0), (x, 1, 0), (0, 1, x), (0, x, 1), (x, 0, 1), (1, 0, x))[int(h)]

def hexcolor(rgb):

tayloraswift

import func Glibc.fopen
import func Glibc.fseek
import func Glibc.ftell
import func Glibc.fclose
import func Glibc.fread
import func Glibc.fwrite
import func Glibc.strerror

import var Glibc.errno

tayloraswift

Swift integer literals

introduction

Swift allows you to initialize any type from an integer literal in source code by conforming it to the ExpressibleByIntegerLiteral protocol. Currently, Int8, Int16, Int32, Int64, Int, and their unsigned counterparts are supported as bootstrap types when the compiler emits code passing source code literals to an ExpressibleByIntegerLiteral.init(integerLiteral:) implementation. This effectively caps the maximum supported integer literal width to 64 bits.

This proposal aims to unlock arbitrary-precision integer literals in a way that:

• will decouple the compile-time overflow checking from the actual passed integer value storage,
• will eliminate the need for magic underscored protocols,

tayloraswift

module: 'NIOConcurrencyHelpers@Swift', id: 's:SzsE2lloiyxx_qd__tSzRd__lFZ::SYNTHESIZED::s:s5Int64V'
module: 'NIOConcurrencyHelpers@Swift', id: 's:s18AdditiveArithmeticPsE1popyxxFZ::SYNTHESIZED::s:s4Int8V'
module: 'NIOConcurrencyHelpers@Swift', id: 's:SzsE1goiySbx_xtFZ::SYNTHESIZED::s:s4Int8V'
module: 'NIOConcurrencyHelpers@Swift', id: 's:SZss17FixedWidthIntegerRzrlEyxqd__cSzRd__lufc::SYNTHESIZED::s:s5Int16V'
module: 'NIOConcurrencyHelpers@Swift', id: 's:s18AdditiveArithmeticPss27ExpressibleByIntegerLiteralRzrlE4zeroxvpZ::SYNTHESIZED::s:s5Int16V'
module: 'NIOConcurrencyHelpers@Swift', id: 's:s17FixedWidthIntegerPsE2apoiyxx_xtFZ::SYNTHESIZED::s:Su'
module: 'NIOConcurrencyHelpers@Swift', id: 's:s17FixedWidthIntegerPsE3ggeoiyyxz_qd__tSzRd__lFZ::SYNTHESIZED::s:s6UInt16V'
module: 'NIOConcurrencyHelpers@Swift', id: 's:SZsE8isSignedSbvpZ::SYNTHESIZED::s:s5Int32V'
module: 'NIOConcurrencyHelpers@Swift', id: 's:s17FixedWidthIntegerPsE3ggeoiyyxz_qd__tSzRd__lFZ::SYNTHESIZED::s:s5Int32V'
module: 'NIOConcurrencyHelpers@Swif

tayloraswift

module: '_Differentiation@Swift', id: 's:s4SIMDPsSF6ScalarRpzrlE2meoiyyxz_xtFZ::SYNTHESIZED::s:s5SIMD2V'
module: '_Differentiation@Swift', id: 's:s4SIMDPss17FixedWidthInteger6ScalarRpzrlE1doiyxAE_xtFZ::SYNTHESIZED::s:s5SIMD8V'
module: '_Differentiation@Swift', id: 's:s4SIMDPss17FixedWidthInteger6ScalarRpzrlE4alleoiyyxz_xtFZ::SYNTHESIZED::s:s5SIMD3V'
module: '_Differentiation@Swift', id: 's:s4SIMDPss17FixedWidthInteger6ScalarRpzrlE2seoiyyxz_AEtFZ::SYNTHESIZED::s:s5SIMD8V'
module: '_Differentiation@Swift', id: 's:s4SIMDPss17FixedWidthInteger6ScalarRpzrlE1aoiyxx_xtFZ::SYNTHESIZED::s:s5SIMD2V'
module: '_Differentiation@Swift', id: 's:s4SIMDPsSF6ScalarRpzrlE1poiyxAD_xtFZ::SYNTHESIZED::s:s5SIMD4V'
module: '_Differentiation@Swift', id: 's:s4SIMDPsEyxqd__cSTRd__7ElementQyd__6ScalarRtzlufc::SYNTHESIZED::s:s5SIMD4V'
module: '_Differentiation@Swift', id: 's:s4SIMDPss17FixedWidthInteger6ScalarRpzrlE20trailingZeroBitCountxvp::SYNTHESIZED::s:s5SIMD4V'
module: '_Differentiation@Swift', id: 's:s4SIMDPss17FixedWidthInteger6Sc

tayloraswift

test project

1. clone a swift project

installing code

1. download from https://code.visualstudio.com/

setting up the vscode-swift extension