Defining Functions in JavaScript
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To create a new function, use the function keyword. Provide a name for the function and define any arguments it should accept:
function functionName(arguments) {
// code block
}
The structure of a function definition includes:
- The
functionkeyword; - The function name, typically in camelCase like variables;
- Arguments enclosed in parentheses
(); - A code block within curly brackets
{}.
Arguments
Functions have their own data storage space. Arguments are values passed to a function, which the function uses as variables. These arguments cease to exist when the function finishes executing.
To define arguments, assign a name to each one:
// Function without arguments
function first() {}
// Function with one argument
function second(argument) {}
// Function with multiple arguments
function third(argument1, argument2, argument3) {}
If a function accepts multiple arguments, separate them with commas (,).
Note
Arguments are used like variables inside the function's code block.
Function calling
To use a function, call it using parentheses () and provide the necessary arguments if the function expects any:
1234567891011// Function Definition function func(arg) { console.log("Argument received:", arg); console.log("Argument type:", typeof arg); } // Function Calling func(1); func(2521); func("Rabbit"); func(true);
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