What It Is This is an arrow function. Arrow functions are a short syntax, introduced by ECMAscript 6, that can be used similarly to the way you would use function expressions. In other words, you can often use them in place of expressions like function (foo) {…}. But they have some important differences. For example, … Read more
Foo(int num): bar(num) This construct is called a Member Initializer List in C++. Simply said, it initializes your member bar to a value num. What is the difference between Initializing and Assignment inside a constructor? Member Initialization: Foo(int num): bar(num) {}; Member Assignment: Foo(int num) { bar = num; } There is a significant difference … Read more
The accepted answer is great. I am making a table that helps in quick comprehension of the topic. The explanation involves a simple variable a as well as an indexed array arr. If we set a=apple # a simple variable arr=(apple) # an indexed array with a single element and then echo the expression in … Read more
The *args and **kwargs is a common idiom to allow arbitrary number of arguments to functions as described in the section more on defining functions in the Python documentation. The *args will give you all function parameters as a tuple: def foo(*args): for a in args: print(a) foo(1) # 1 foo(1,2,3) # 1 # 2 … Read more
The difference is that functionOne is a function expression and so only defined when that line is reached, whereas functionTwo is a function declaration and is defined as soon as its surrounding function or script is executed (due to hoisting). For example, a function expression: // TypeError: functionOne is not a function functionOne(); var functionOne … Read more
(Sourced from here.) Square bracket notation allows the use of characters that can’t be used with dot notation: var foo = myForm.foo[]; // incorrect syntax var foo = myForm[“foo[]”]; // correct syntax including non-ASCII (UTF-8) characters, as in myForm[“ダ”] (more examples). Secondly, square bracket notation is useful when dealing with property names which vary in … Read more
PHP strings can be specified not just in two ways, but in four ways. Single quoted strings will display things almost completely “as is.” Variables and most escape sequences will not be interpreted. The exception is that to display a literal single quote, you can escape it with a back slash \’, and to display … Read more
AFAIK >>= is the “same” operation. you can either call i = i << 4; or i <<= 4; It has the same effect. It’s like i = i + 5; and i += 5;