What does % do to strings in Python?
It’s the string formatting operator. Read up on string formatting in Python. format % values Creates a string where format specifies a format and values are the values to be filled in.
operators
Strange javascript operator: expr >>> 0 [duplicate]
>>> is the Zero-fill right shift operator. The >>> 0 is an abuse of the operator to convert any numeric expression to an “integer” or non-numeric expression to zero. Here is what it does: This operator shifts the first operand the specified number of bits to the right. Excess bits shifted off to the right … Read more
Does the unary + operator have any practical use?
char ch=”a”; std::cout << ch << ‘\n’; std::cout << +ch << ‘\n’; The first insertion writes the character a to cout. The second insertion writes the numeric value of ch to cout. But that’s a bit obscure; it relies on the compiler applying integral promotions for the + operator.
One plus plus two compiles unexpectedly [duplicate]
Java is interpreting the working 1 + + 2 as 1 plus positive 2. See the Unary operator section.
How to check if div element is empty [duplicate]
Using plain javascript var isEmpty = document.getElementById(‘cartContent’).innerHTML === “”; And if you are using jquery it can be done like var isEmpty = $(“#cartContent”).html() === “”;
Find Pythagorean triplet for which a + b + c = 1000
#include <math.h> #include <stdio.h> int main() { const int sum = 1000; int a; for (a = 1; a <= sum/3; a++) { int b; for (b = a + 1; b <= sum/2; b++) { int c = sum – a – b; if ( a*a + b*b == c*c ) printf(“a=%d, b=%d, c=%d\n”,a,b,c); … Read more
Language support for chained comparison operators (x < y < z)
It should be more common, but I suspect it is not because it makes parsing languages more complex. Benefits: Upholds the principle of least surprise Reads like math is taught Reduces cognitive load (see previous 2 points) Drawbacks: Grammar is more complex for the language Special case syntactic sugar As to why not, my guesses … Read more
What is the ..= (dot dot equals) operator in Rust?
This is the inclusive range operator. The range x..=y contains all values >= x and <= y, i.e. “from x up to and including y”. This is in contrast to the non-inclusive range operator x..y, which doesn’t include y itself. fn main() { println!(“{:?}”, (10..20) .collect::<Vec<_>>()); println!(“{:?}”, (10..=20).collect::<Vec<_>>()); } // Output: // // [10, 11, … Read more
Combined Comparison / “Spaceship” Operator () in Javascript?
As far as I know there is no such operator in JavaScript but you can use Math.sign() function: Math.sign(a – b); NOTE: As was mentioned in comments, Math.sign() is not currently supported by all browsers. Check for compatibility (MDN).