In most languges, conditional control statements often require expressions that
evaluate to boolean values: one of true or false. In JavaScript however,
non-boolean values can also be used in conditional control statements. Values
that are treated as false but are not actually false themselves are said
to be falsy. The same goes with truthy values with respect to true.
const, let, and var are 3 different ways to declare a variable in
JavaScript, each with different consequences in terms of scope and assignment.
Simply put, the arguments object contains all arguments or parameters
passed into the current function. It’s worth emphasizing that arguments
is only defined and accessible from within the scope of a function. For example:
Short circuiting in JavaScript (and other languages) is when only part of a boolean expression is evaluated in order to get the result of the entire expression.
... Read more