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What optimizations can GHC be expected to perform reliably?
...Right x
As an extended example, take this definition of last:
last [] = error "last: empty list"
last (x:[]) = x
last (x:x2:xs) = last (x2:xs)
We first transform it to
last_nil = error "last: empty list"
last_cons x [] = x
last_cons x (x2:xs) = last (x2:xs)
{-# INLINE last #-}
last [] = last_...
Add an element to an array in Swift
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Error: Value of type 'Array<Element>' has no member 'appendContentsOf'
– Dani Kemper
Oct 17 '18 at 22:55
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How to delete a character from a string using Python
There is a string, for example. EXAMPLE .
16 Answers
16
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Difference between `set`, `setq`, and `setf` in Common Lisp?
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(set ls '(1 2 3 4)) => Error - ls has no value
(set 'ls '(1 2 3 4)) => OK
(setq ls '(1 2 3 4)) => OK - make ls to (quote ls) and then have the usual set
(setf ls '(1 2 3 4)) => OK - same as setq so far BUT
(setf (car ls) 10) => Make...
How to exit a 'git status' list in a terminal?
... If you're getting the E37: No write since last change (add ! to override) error, do what it says and use :q!
– Noumenon
Aug 24 '15 at 15:05
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What is that “total” in the very first line after ls -l? [closed]
What is the total in the output of ls -l ?
4 Answers
4
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Is null check needed before calling instanceof?
...B b) {
// Overloaded version. Would cause reference ambiguity (compile error)
// if Test.test(null) was called without casting.
// So you need to call Test.test((A)null) or Test.test((B)null).
}
}
So Test.test((A)null) will print a instanceof A: false.)
P.S.: If you are hiring, pl...
How to use SharedPreferences in Android to store, fetch and edit values [closed]
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this.getSharedPreferences gives me the following error: The method getSharedPreferences(String, int) is undefined for the type MyActivity
– Si8
Jul 29 '13 at 19:14
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How to get the nth occurrence in a string?
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edited May 31 '16 at 15:05
answered May 31 '16 at 15:00
S...
Swift Beta performance: sorting arrays
I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here:
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