and is the same as && but with lower precedence. They both use short-circuit evaluation. WARNING: and even has lower precedence than = so you’ll usually want to avoid and. An example when and should be used can be found in the Rails Guide under “Avoiding Double Render Errors“.
No, it doesn’t, see:Â R Language Definition: Operators
It’s a matter of operator precedence. || has a higher precedence than or. So, in between the two you have other operators including ternary (? 🙂 and assignment (=) so which one you choose can affect the outcome of statements. Here’s a ruby operator precedence table. See this question for another example using and/&&. Also, … Read more
=~ is the operator testing a regular expression match. The expression /9eaf/ is a regular expression (the slashes // are delimiters, the 9eaf is the actual regular expression). In words, the test is saying “If the variable $tag matches the regular expression /9eaf/ …” and this match occurs if the string stored in $tag contains those characters 9eaf consecutively, in order, at any point. So this … Read more
Modulus operator; gives the remainder of the left value divided by the right value. Like: 3 % 1 would equal zero (since 3 divides evenly by 1) 3 % 2 would equal 1 (since dividing 3 by 2 results in a remainder of 1).
== and != do not take into account the data type of the variables you compare. So these would all return true: === and !== do take into account the data type. That means comparing a string to a boolean will never be true because they’re of different types for example. These will all return false: You should compare data types for functions that … Read more
As pointed out (and hopefully unsurprisingly), using if+else is indeed the idiomatic way to do conditionals in Go. In addition to the full blown var+if+else block of code, though, this spelling is also used often: and if you have a block of code that is repetitive enough, such as the equivalent of int value = a <= b ? a : b, … Read more
Modulus operator; gives the remainder of the left value divided by the right value. Like: 3 % 1 would equal zero (since 3 divides evenly by 1) 3 % 2 would equal 1 (since dividing 3 by 2 results in a remainder of 1).
It does 5 things: It creates a new object. The type of this object is simply object. It sets this new object’s internal, inaccessible, [[prototype]] (i.e. __proto__) property to be the constructor function’s external, accessible, prototype object (every function object automatically has a prototype property). It makes the this variable point to the newly created object. It executes the constructor function, using the newly created … Read more
This is commonly referred to as the conditional operator, and when used like this: … if the condition evaluates to true, the expression evaluates to result_if_true, otherwise it evaluates to result_if_false. It is syntactic sugar, and in this case, it can be replaced with