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Don’t believe
everything you learn
@mheap at #phpsc17
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Things we believe are true
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Things we believe are true
But they’re not
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Falsehoods programmers
believe about X
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Michael
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Time
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@mheap
The number of days in every month
starts with a 3, so either 30 or 31?
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@mheap
The number of days in every month
starts with a 3, so either 30 or 31?
February has 28
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#phpsc17
Each month always has the same
number of days every year though?
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#phpsc17
Each month always has the same
number of days every year though?
February has 29 in leap years
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@mheap
But we can calculate leap years.
They’re every four years
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@mheap
But we can calculate leap years.
They’re every four years
Unless it’s divisible by 100
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#phpsc17
But we can calculate leap years.
They’re every four years
(Unless it’s divisible by 100)
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#phpsc17
But we can calculate leap years.
They’re every four years
(Unless it’s divisible by 100)
If it divides by 100 and 400, it
is a leap year
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@mheap
But that rule holds all the time
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@mheap
But that rule holds all the time
Unless you’re Sweden
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#phpsc17
February is 28 or 29 days
February the 30th doesn’t exist
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#phpsc17
February is 28 or 29 days
February the 30th doesn’t exist
Unless you’re Sweden
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#phpsc17
February is 28 or 29 days
February the 30th doesn’t exist
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#phpsc17
February is 28 or 29 days
February the 30th doesn’t exist
Or the Soviet Union
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@mheap
A month starts and ends in
the same year
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@mheap
A month starts and ends in
the same year
Not in ancient Rome
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@mheap
A month starts and ends in
the same year
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@mheap
A month starts and ends in
the same year
Or a modern Ethiopia
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#phpsc17
Excluding DST, time always
goes forwards
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#phpsc17
Excluding DST, time always
goes forwards
Shanghai, 1927
1927-12-31 23:54:08 happened twice
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Modern Time
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@mheap
The day before Saturday
is always Friday
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@mheap
The day before Saturday
is always Friday
Samoa, 2011
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#phpsc17
The offsets between two timezones
will always be the same
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#phpsc17
The offsets between two timezones
will always be the same
10 changes in 2016
2 changes so far in 2017
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@mheap
Timezones are always +/-
an integer number of hours
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@mheap
Timezones are always +/-
an integer number of hours
Afghanistan, +04:30
New Zealand (Chatham Islands), +12:45
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#phpsc17
15 minutes is safe though?
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#phpsc17
15 minutes is safe though?
UTC-00:25:21 - Dublin Mean Time
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@mheap
If they do change, there’ll be
plenty of notice
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@mheap
If they do change, there’ll be
plenty of notice
North Korea, 2015
8 days notice of a 30 minute change
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Audience Participation
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@mheap
There are always 24 hours in a day
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@mheap
There are always 24 hours in a day
Daylight Savings Time
Means 23 or 25 hours in a day
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#phpsc17
Is the time 23:59:60 invalid?
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#phpsc17
Is the time 23:59:60 invalid?
Leap seconds
A minute can have 61 seconds
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Names
HELLO
, M
Y
N
AM
E
IS
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@mheap
A child will have the same surname as
either their mother or father (or both)
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@mheap
A child will have the same surname as
either their mother or father (or both)
Not in Iceland
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#phpsc17
People have at least 2 names
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#phpsc17
People have at least 2 names
Teller (of Penn & Teller fame)
Akihito (Emperor of Japan)
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@mheap
People’s names do not
contain numbers
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@mheap
People’s names do not
contain numbers
John 5
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#phpsc17
People’s names do not
contain numbers
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#phpsc17
People’s names do not
contain numbers
K8lyn? (Kaitlyn)
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#phpsc17
People’s names do not
contain numbers
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#phpsc17
People’s names do not
contain numbers
KVIIIlyn
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@mheap
For every rule, there are
guaranteed to be exceptions
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@mheap
For every rule, there are
guaranteed to be exceptions
No spaces
Van Buren
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@mheap
For every rule, there are
guaranteed to be exceptions
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@mheap
For every rule, there are
guaranteed to be exceptions
Only letters
O’Reilly
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@mheap
For every rule, there are
guaranteed to be exceptions
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@mheap
For every rule, there are
guaranteed to be exceptions
One capital letter
McDonald
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Audience Participation
HELLO
, M
Y
N
AM
E
IS
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@mheap
A name must contain one or
more alphanumeric characters
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@mheap
A name must contain one or
more alphanumeric characters
⽑毛泽东
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#phpsc17
A name must contain one or
more unicode characters
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#phpsc17
A name must contain one or
more unicode characters
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@mheap
I can safely assume that this list
of bad words has no names in it
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@mheap
I can safely assume that this list
of bad words has no names in it
Ever been to Middlesex?
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@mheap
I can safely assume that this list
of bad words has no names in it
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@mheap
I can safely assume that this list
of bad words has no names in it
Eaten shittake mushrooms?
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@mheap
I can safely assume that this list
of bad words has no names in it
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@mheap
I can safely assume that this list
of bad words has no names in it
Been named Craig Cockburn?
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@mheap
I can safely assume that this list
of bad words has no names in it
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@mheap
I can safely assume that this list
of bad words has no names in it
Linda Callahan?
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@mheap
I can safely assume that this list
of bad words has no names in it
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#phpsc17
What about less obvious ones?
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#phpsc17
What about less obvious ones?
Super Bowl XXX
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@mheap
Did you hear about planning
permission emails bouncing?
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@mheap
Did you hear about planning
permission emails bouncing?
Erection of a structure
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#phpsc17
The sad story of
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#phpsc17
The sad story of
Christopher Null
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Addresses
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#phpsc17
A building number is numeric
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#phpsc17
A building number is numeric
1A Egmont Road, Middlesbrough,
TS4 2HT
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@mheap
No buildings are numbered zero
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@mheap
No buildings are numbered zero
0 Egmont Road, Middlesbrough,
TS4 2HT
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#phpsc17
If the addresses on the left are even,
addresses on the right must be odd
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#phpsc17
If the addresses on the left are even,
addresses on the right must be odd
Seine-Saint-Denis, France
Even numbers on both sides, no odds
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@mheap
You can omit leading zeros
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@mheap
You can omit leading zeros
101 Alma St, Palo Alto
Apartments 1 and 001 on different floors.
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#phpsc17
A street name won't include a number
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#phpsc17
A street name won't include a number
8 Seven Gardens Burgh, Woodbridge,
IP13 6SU
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@mheap
You wouldn’t name a town Street
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@mheap
You wouldn’t name a town Street
Street, Somerset, UK
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#phpsc17
You can’t have two towns/cities with
the same name in a country
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#phpsc17
You can’t have two towns/cities with
the same name in a country
The UK has three places
named Newport
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@mheap
Those cities don’t have
duplicate street names
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@mheap
Those cities don’t have
duplicate street names
10 High Street, Newport, PO30 1SS
10 High Street, Newport, NP20 1FQ
10 High Street, Newport, TF10 7AN
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#phpsc17
Street names will be
reasonably short
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#phpsc17
Street names will be
reasonably short
Aleja Alije Izetbegovića Prvig
Predsjednika Predsjedništva Republika
Bosna i Hercegovina
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@mheap
A building has a single postcode
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@mheap
A building has a single postcode
DVLA Swansea:
V5Cs are processed at SA99 1BA,
Driving licences at SA99 1AB
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#phpsc17
Addresses are a fixed point
in space
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#phpsc17
Addresses are a fixed point
in space
BF1 4FB
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@mheap
Concrete buildings are a fixed
point in space
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@mheap
Concrete buildings are a fixed
point in space
In Zürich, a 6200 ton building was
moved by 60 meters to make way for
railway tracks
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Audience Participation
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#phpsc17
Do all countries have a
capital city?
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#phpsc17
Do all countries have a
capital city?
Switzerland does not. The government
is currently in Bern, but the city is not
the capital
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Commerce
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#phpsc17
A product has one price
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#phpsc17
A product has one price
Price with tax, price without tax, sale
price, list price, minimum price
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@mheap
A product has a price
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@mheap
A product has a price
Products sold on auction sites
do not have a price until it’s sold
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#phpsc17
Currencies symbols uniquely
identify a currency
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#phpsc17
Currencies symbols uniquely
identify a currency
The peso and dollar sign $ is
used by many countries
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@mheap
Currencies have a unicode symbol
that represents them
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@mheap
Currencies have a unicode symbol
that represents them
The Swiss franc does not
Until 2010, neither did the Indian rupee
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#phpsc17
Currencies symbols uniquely
identify a currency
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#phpsc17
Currencies symbols uniquely
identify a currency
The peso and dollar sign $ is
used by many countries
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Audience Participation
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@mheap
Locale doesn’t matter for currency
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@mheap
Locale doesn’t matter for currency
1.000
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#phpsc17
The currency symbol always precedes
the amount e.g. £1.50
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#phpsc17
The currency symbol always precedes
the amount e.g. £1.50
1.50€ in Spain
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@mheap
The currency symbol always
precedes or follows the amount
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@mheap
The currency symbol always
precedes or follows the amount
1€50 in France
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Computers
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The network is reliable.
Latency is zero.
Bandwidth is infinite.
The network is secure.
Topology doesn't change.
There is one administrator.
Transport cost is zero.
The network is homogeneous.
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In summary
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In summary
Computers are hard
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In summary
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In summary
Humans make assumptions
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In summary
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In summary
Things are never as simple
as they seem
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@mheap
https://joind.in/21483