Here are two ways: In [1]: my_array = arange(10) In [2]: where((my_array > 3) & (my_array < 7)) Out[2]: (array([4, 5, 6]),) In [3]: where(logical_and(my_array > 3, my_array < 7)) Out[3]: (array([4, 5, 6]),) For the first (replacing and with &), be careful to add parentheses appropriately: & has higher precedence than the comparison operators. … Read more
The && and || operators short-circuit. That is: 1) If && evaluates its first operand as false, it does not evaluate its second operand. 2) If || evaluates its first operand as true, it does not evaluate its second operand. This lets you do null check && do something with object, as if it is … Read more
Prefixing any search qualifier with a – excludes all results that are matched by that qualifier. For example, you might be interested in finding all “cats” repositories with more than 10 stars that are not written in JavaScript: cats stars:>10 -language:javascript You might also want to find all issues mentioning @defunkt that are not in … Read more
In JavaScript, both || and && are logical short-circuit operators that return the first fully-determined “logical value” when evaluated from left to right. In expression X || Y, X is first evaluated, and interpreted as a boolean value. If this boolean value is “true”, then it is returned. And Y is not evaluated. (Because it … Read more
The two are not the same. The first will never evaluate Foo() because the 1 short-circuits the ||. Why it’s done – probably someone wanted to force entry in the then branch for debugging purposes and left it there. It could also be that this was written before source control, so they didn’t want the … Read more
I prefer to think of it as “bitwise vs. conditional” rather than “logical vs conditional” since the general concept of “logical” applies in both cases. x & y // bitwise AND, 0101 & 0011 = 0001 x | y // bitwise OR, 0101 | 0011 = 0111 x && y // true if both x … Read more
You can find === and !== operators in several other dynamically-typed languages as well. It always means that the two values are not only compared by their “implied” value (i.e. either or both values might get converted to make them comparable), but also by their original type. That basically means that if 0 == “0” … Read more
Yes. In C# && and || are short-circuiting and thus evaluates the right side only if the left side doesn’t already determine the result. The operators & and | on the other hand don’t short-circuit and always evaluate both sides. The spec says: The && and || operators are called the conditional logical operators. They … Read more
It seems you can’t do it “directly” Try use helper, why not? Register helper in your javascript code: Handlebars.registerHelper(‘ifEquals’, function(arg1, arg2, options) { return (arg1 == arg2) ? options.fn(this) : options.inverse(this); }); Use in template: {{#ifEquals sampleString “This is a string”}} Your HTML here {{/ifEquals}} More details here: Logical operator in a handlebars.js {{#if}} conditional … Read more
First of all, thanks for pointing out that the spec isn’t clear on the non-dynamic nullable-bool case. I will fix that in a future version. The compiler’s behavior is the intended behavior; && and || are not supposed to work on nullable bools. The dynamic binder does not seem to implement this restriction, though. Instead, … Read more