ReferenceError: Invalid left-hand side in assignment
You have to use == to compare (or even ===, if you want to compare types). A single = is for assignment. if (one == ‘rock’ && two == ‘rock’) { console.log(‘Tie! Try again!’); }
You have to use == to compare (or even ===, if you want to compare types). A single = is for assignment. if (one == ‘rock’ && two == ‘rock’) { console.log(‘Tie! Try again!’); }
(This is a generalization of your idea for two arrays.) If you start by looking at the five medians of the five arrays, obviously the overall median must be between the smallest and the largest of the five medians. Proof goes something like this: If a is the min of the medians, and b is … Read more
If my driveway is empty, I cannot assert that all cars parked there are red. Consider the following statements. S1: My driveway is empty. S2: All the cars parked in my driveway are red. I claim that S1 implies S2. That is, the statement S1 => S2 is true. I will do this by showing … Read more
The comma operator chains multiple expressions together, and the result of the operation is the value of the last operand. The only real use for it is when you need multiple side effects to occur, such as assignment or function calls.
Essentially, Coq has both because they are useful for different things: booleans correspond to facts that can be checked mechanically (i.e., with an algorithm), whereas propositions can express more concepts. Strictly speaking, the logical and boolean worlds are not separate in Coq: the boolean world is a subset of the logical world. In other words, … Read more
If you are extending your form from a ModelForm, use the instance keyword argument. Here we pass either an existing instance or a new one, depending on whether we’re editing or adding an existing article. In both cases the author field is set on the instance, so commit=False is not required. Note also that I’m … Read more
What about boring, old, readable, and shortest yet: float clip(float n, float lower, float upper) { return std::max(lower, std::min(n, upper)); } ? This expression could also be ‘genericized’ like so: template <typename T> T clip(const T& n, const T& lower, const T& upper) { return std::max(lower, std::min(n, upper)); } Update Billy ONeal added: Note that … Read more
Consider using finite domain constraints, for example, in SWI-Prolog: :- use_module(library(clpfd)). puzzle([S,E,N,D] + [M,O,R,E] = [M,O,N,E,Y]) :- Vars = [S,E,N,D,M,O,R,Y], Vars ins 0..9, all_different(Vars), S*1000 + E*100 + N*10 + D + M*1000 + O*100 + R*10 + E #= M*10000 + O*1000 + N*100 + E*10 + Y, M #\= 0, S #\= 0. … Read more
Quoting Java Language Specification, 15.7 Evaluation Order: The Java programming language guarantees that the operands of operators appear to be evaluated in a specific evaluation order, namely, from left to right. The left-hand operand of a binary operator appears to be fully evaluated before any part of the right-hand operand is evaluated. If the operator … Read more
My rule of thumb, which covers basically 99% of all use cases for conditional statements, is: Grouping: () Member access . or […] Not: ! Comparison, e.g. < , >= , === , !=, … Logical AND && Logical OR || MDN gives you the exhaustive breakdown: Javascript Operator Precedence so for your example: (firstRun … Read more