associativity Questions
1
Solved
For an associative operation f over the elements of array a, the following relation should hold true: a.reduce(f) should be equivalent to a.reduceRight(f).
Indeed, it does hold true for operations ...
Multicolored asked 2/12, 2014 at 15:11
1
Solved
Shouldn’t it be Left Associative?
I think
let a = b ?? c ?? d
is grouped like
let a = (b ?? c) ?? d
not
let a = b ?? (c ?? d)
But it is declared as a Right Associative. Do I misunderstand or mis...
Waldron asked 15/10, 2014 at 10:18
3
Solved
The logical AND and OR operators are the only lazy operators in JavaScript along with the ternary conditional operator. They are tested for short-circuit evaluation using the following rules:
fals...
Jainism asked 15/12, 2013 at 6:27
1
Solved
Mathematically the function composition operation is associative. Hence:
f . (g . h) = (f . g) . h
Thus the function composition operation may be defined to be either left associative or right a...
Jannjanna asked 3/12, 2013 at 4:24
1
Solved
I have been trying create my parser for expression with variables and simplify them to quadratic expression form.
This is my parser grammar:
Exercise : Expr '=' Expr
Expr : Term [+-] Expr | Term
...
Selwyn asked 1/12, 2013 at 23:45
4
Solved
Is a && b && c defined by the language to mean (a && b) && c or a && (b && c)?
Wow, Jerry was quick. To beef up the question: does it actually matte...
Adiabatic asked 18/11, 2013 at 16:41
2
Solved
Most programming languages have a table of precedence and associativity for binary operators. Associativity matters in some cases e.g. (a - b) - c != a - (b - c).
However, for an associative opera...
Salot asked 17/11, 2013 at 10:57
2
Solved
According to this precedence table, the comma operator is left-associative. That is, a, b, c is parsed as (a, b), c. Is that a necessity? Wouldn't a, (b, c) have the exact same behavior?
Broadway asked 23/12, 2012 at 11:29
2
Solved
If we have an expression:
a $ b @ c
$ is a left-associative operator, @ is right-associative.
They have the same precedence.
How is this expression parsed? As (a $ b) @ c or as a $ (b @ c)?
Anthropo asked 12/4, 2013 at 5:54
1
Solved
Say I have an expression as follows (where ⨁ and ⨂ are binary operators which have the same precedence level but not the same associativity):
x ⨁ y ⨂ z
Would y belong to ⨁ or ⨂, and based on wha...
Dive asked 27/2, 2013 at 16:41
2
Solved
Please note, that this has nothing to do with Operator Precedence.. () and ++ , Undefined behavior and sequence points , Why are these constructs using pre and post-increment undefined behavior? a...
Craggie asked 17/8, 2012 at 12:16
2
Solved
Some compiler books / articles / papers talk about design of a grammar and the relation of its operator's associativity. I'm a big fan of top-down, especially recursive descent, parsers and so far ...
Shashaban asked 27/5, 2011 at 6:39
4
Solved
What is happening below?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class DotNetPad
{
public static void Main(string[] args)
{
int i = 10;
st...
Stansberry asked 2/5, 2012 at 13:55
2
Solved
In the C99 standard, the expressions allow for precedence and associativity.
Precedence is documented quite well since the order in which the operators appear in the document are of reducing prece...
Heindrick asked 23/2, 2012 at 6:19
2
Solved
Is it possible to construct a higher order function isAssociative that takes another function of two arguments and determines whether that function is associative?
Similar question but for other p...
Sneck asked 28/12, 2011 at 6:20
1
Solved
(m >>= f) >>= g = m >>= (\x -> f x >>= g)
what's different from f and \x->f x ??
I think they're the same type a -> m b. but it seems that the second >>= at...
Monoculture asked 1/12, 2011 at 20:43
2
Solved
I'm trying to figure out how to do a left-associative expression where recursive (not-enclosed in anything) expressions are possible. For example, I'd like to do:
expr + OP + expr
that parses 2 ...
Haemolysin asked 31/12, 2010 at 17:34
5
Solved
Ahh, don't you just love a good ternary abuse? :) Consider the following expression:
true ? true : true ? false : false
For those of you who are now utterly perplexed, I can tell you that this e...
Greengrocery asked 19/11, 2009 at 14:11
1
Solved
When I type this:
puts 'repeat' * 3
I get:
>> repeat repeat repeat
But it's not working if I do this:
puts 3 * 'repeat'
Why?
Sternberg asked 30/3, 2010 at 6:59
4
Given the code:
my $x = 1;
$x = $x * 5 * ($x += 5);
I would expect $x to be 180:
$x = $x * 5 * ($x += 5); #$x = 1
$x = $x * 5 * 6; #$x = 6
$x = 30 * 6;
$x = 180;
180;
But instead it is 30; h...
Hypercorrect asked 5/11, 2009 at 17:46
6
Solved
We get into unnecessary coding arguments at my work all-the-time. Today I asked if conditional AND (&&) or OR (||) had higher precedence. One of my coworkers insisted that they had the same...
Sponson asked 28/7, 2009 at 21:0
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