JavaScript function syntax, event handling, and basic DOM manipulation methods explained with a short example each.
42 cards · basic cards · AI-written, checked twice. Edit anything.
- What is the syntax for a basic function declaration in JavaScript?
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function functionName(parameters) { return value; }- How do you write a function expression?
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const functionName = function(parameters) { return value; };- What is the arrow function syntax?
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const functionName = (parameters) => { return value; };- What does a return statement do in a function?
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It exits the function and sends back a value to the caller.- How do you set a default parameter value in a function?
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function greet(name = 'Guest') { return 'Hello ' + name; }- What does the rest parameter (...) allow a function to do?
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Accept a variable number of arguments as an array.- What is function scope in JavaScript?
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Variables declared inside a function are only accessible within that function.- What is a closure?
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A function that has access to variables from its outer function's scope even after that outer function has returned.- What is a callback function?
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A function passed as an argument to another function, to be executed later.- What is an anonymous function?
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A function without a name, often used as a callback or stored in a variable.- What is an IIFE (Immediately Invoked Function Expression)?
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(function() { code here })(); - a function that runs immediately upon definition.- What is function hoisting?
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Function declarations are moved to the top of their scope before code execution, so they can be called before they are defined.- What does the bind() method do?
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It creates a new function with a fixed this context and optional pre-filled arguments.- What does the call() method do?
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It invokes a function with a specified this context and arguments passed individually.- What does the apply() method do?
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It invokes a function with a specified this context and arguments passed as an array.
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