Starting Python 3.8, and the introduction of assignment expressions (PEP 572) (:= operator), it’s now possible to capture the condition value (isBig(y)) as a variable (x) in order to re-use it within the body of the condition: if x := isBig(y): return x
You make the mistake of thinking of operator= as a two-argument function, where the side effects of the arguments must be completely evaluated before the function begins. If that were the case, then the expression i = ++i + 1 would have multiple sequence points, and ++i would be fully evaluated before the assignment began. … Read more
You can use Object.assign: var fruit = { name: “Apple” }; var vegetable = Object.assign({}, fruit); vegetable.name = “potatoe”; console.log(fruit);
The data in Elixir is still immutable, but there are couple of shorthands, that let you type less or don’t worry about finding new names. In Erlang, you could often see code like this: SortedList = sort(List), FilteredList = filter(SortedList), List3 = do_something_with(FilteredList), List4 = another_thing_with(List3) In Elixir, you could just write: list = sort(list) … Read more
A slightly better way, avoiding the possible security implications of using eval, is declare “$var=$val” Note that declare is a synonym for typeset in bash. The typeset command is more widely supported (ksh and zsh also use it): typeset “$var=$val” In modern versions of bash, one should use a nameref. declare -n var=x x=$val It’s … Read more
I agree with the other answers but would like to explain the important point here. None object is singleton object. How many times you assign None object to a variable, same object is used. So x = None y = None is equal to x = y = None but you should not do the … Read more
The first example (which compiles) is special because both operands of the addition are literals. A few definitions to start with: Converting an int to char is called a narrowing primitive conversion, because char is a smaller type than int. ‘A’ + 1 is a constant expression. A constant expression is (basically) an expression whose result is … Read more
All credit goes to @MarkDickinson, who answered this in a comment: Notice the + in (target_list “=”)+, which means one or more copies. In foo = bar = 5, there are two (target_list “=”) productions, and the expression_list part is just 5 All target_list productions (i.e. things that look like foo =) in an assignment … Read more
You don’t need deal at all (edit: for Matlab 7.0 or later) and, for your example, you don’t need mat2cell; you can use num2cell with no other arguments:: foo = [88, 12]; fooCell = num2cell(foo); [x y]=fooCell{:} x = 88 y = 12 If you want to use deal for some other reason, you can: … Read more
assignment: throwing away the old value of a variable and replacing it with a new one initialization: it’s a special kind of assignment: the first. Before initialization objects have null value and primitive types have default values such as 0 or false. Can be done in conjunction with declaration. declaration: a declaration states the type … Read more