create a function in javascript

In JavaScript, a function is defined using the keyword function, followed by a name for the function (optional), a list of parameters (also optional) enclosed in parentheses, and the function body enclosed in curly braces {}. Here is the basic syntax:

index.tsx
function functionName(parameter1, parameter2) {
  // function body
  return someValue;
}
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The function name and parameters are optional, but the function body must always be enclosed in curly braces. The return keyword is used to specify the value that the function should return when it is called.

Here is an example of a simple function that takes two parameters and returns their sum:

index.tsx
function addNumbers(num1, num2) {
  var sum = num1 + num2;
  return sum;
}
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You can call this function by passing in two arguments and capturing the return value:

index.tsx
var result = addNumbers(2, 3);
console.log(result); // outputs 5
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In this example, the function addNumbers takes two parameters (num1 and num2) and returns their sum. The result of calling the function with arguments 2 and 3 is assigned to the variable result, which is then printed to the console using console.log().