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Lambda function in list comprehensions
... calls it ten times.
The second one doesn't call the function. It creates 10 different lambda functions. It puts all of those in a list. To make it equivalent to the first you need:
[(lambda x: x*x)(x) for x in range(10)]
Or better yet:
[x*x for x in range(10)]
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Scala: what is the best way to append an element to an Array?
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206
You can use :+ to append element to array and +: to prepend it:
0 +: array :+ 4
should produ...
How to empty a list in C#?
...ecrocomment this because some misinformation has been provided here as of 2020.List<T>.Clear properly clears all references which allows the GC to clear the allocs when necessary. new List<T> does NOT do this and is unsuitable in effectively all scenarios
– John
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String replacement in Objective-C
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edited Mar 20 '09 at 22:45
answered Mar 20 '09 at 22:39
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Determine if an object property is ko.observable
I'm using KnockoutJS version 2.0.0
4 Answers
4
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Adding up BigDecimals using Streams
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edited Mar 25 '14 at 18:10
answered Mar 25 '14 at 13:25
sk...
What does the `#` operator mean in Scala?
...t; val a1 = new A
a1: A = A@1497b7b1
scala> val a2 = new A
a2: A = A@2607c28c
scala> a2.f(new a1.B)
<console>:11: error: type mismatch;
found : a1.B
required: a2.B
a2.f(new a1.B)
^
scala> a2.g(new a1.B)
Got a B.
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Overload constructor for Scala's Case Classes?
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190
Overloading constructors isn't special for case classes:
case class Foo(bar: Int, baz: Int) {
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What makes Lisp macros so special?
...le syntax for a common case. The line
divisibleByTwo = [x for x in range(10) if x % 2 == 0]
yields a list containing all even numbers between 0 and 9. Back in the Python 1.5 days there was no such syntax; you'd use something more like this:
divisibleByTwo = []
for x in range( 10 ):
if x % 2 ...
What is the purpose of a plus symbol before a variable?
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edited Apr 10 '19 at 13:32
Daniel W.
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