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How many arguments can a JavaScript function have?
You can specify up to 255 parameters in a function definition. However, you usually don’t need that many parameters.
How do you pass an optional argument in JavaScript?
To declare optional function parameters in JavaScript, there are two approaches: Using the Logical OR operator (‘||’): In this approach, the optional parameter is Logically ORed with the default value within the body of the function. Note: The optional parameters should always come at the end on the parameter list.
Which is the main purpose of JavaScript?
JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user.
How are arguments passed to a function in JavaScript?
JavaScript arguments are passed by value: The function only gets to know the values, not the argument’s locations. If a function changes an argument’s value, it does not change the parameter’s original value.
How are arguments like an array in JavaScript?
arguments is an Array-like object accessible inside functions that contains the values of the arguments passed to that function. Note: “Array-like” means that arguments has a length property and properties indexed from zero, but it doesn’t have Array’s built-in methods like forEach and map. See §Description for details.
How to handle command line arguments in JavaScript?
Here are the node docs on handling command line args: process.argv is an array containing the command line arguments. The first element will be ‘node’, the second element will be the name of the JavaScript file. The next elements will be any additional command line arguments.
How are arguments handled in a Node.js script?
This tutorial was verified with Node v16.10.0, npm v7.12.2, and commander v7.2.0. Node.js supports a list of passed arguments, known as an argument vector. The argument vector is an array available from process.argv in your Node.js script.