JavaScript is programming language, it is used to enhance HTML pages and is commonly found with HTML codes
- Using let
- Using var
- Using const
If you think the value of the variable can change, use let.
If you want a general rule: always declare variables with const.
If you working on old pages you can use var.
The control flow is the order in which the computer executes statements in a script. Code is run in order from the first line in the file to the last line, unless the computer runs across the (extremely frequent) structures that change the control flow, such as conditionals and loops.
The function could also include a loop, which iterates through all of the fields in the form, checking each one in turn. Looking back at the code in the if and else sections, the lines promptUser and submitForm could also be calls to other functions in the script
A JavaScript function is a block of code designed to perform a particular task. A JavaScript function is executed when "something" invokes it (calls it).
t a high level, an expression is a valid unit of code that resolves to a value. There are two types of expressions: those that have side effects (such as assigning values) and those that purely evaluate. The expression x = 7 is an example of the first type. This expression uses the = operator to assign the value seven to the variable x. The expression itself evaluates to 7.
** Const x = 1 +2 * 3** ** const y = 3 * 2 + 1**
*They both equal 7 just worded diffrently. Despite * and + coming in different orders, both expressions would result in 7 because * has precedence over +, so the -joined expression will always be evaluated first.