Difference Between Normal Function And Arrow Function In Javascript
distinguishing normal functions from arrow functions in JavaScript
Difference Between Normal Function And Arrow Function In Javascript
In JavaScript, normal functions are defined using the `function` keyword, and have their own scope for `this` which is dependent on how they are called. On the other hand, arrow functions are defined using the arrow syntax `() => {}` and they do not have their own `this` binding, instead they inherit `this` from the parent scope at the time of their definition. This makes arrow functions particularly useful for concise code and avoiding issues related to `this` binding in callback functions.
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1 - Normal function in JavaScript is defined using the function keyword followed by a function name, optional parameters in parentheses, and code block in curly braces. Arrow function, introduced in ES6, is defined using the fat arrow (=>) syntax, which is shorter and more concise compared to a normal function.
2) Normal functions have their own “this” keyword bound to the function context, which may cause unexpected behavior in certain scenarios. On the other hand, arrow functions inherit the “this” value from the surrounding code, making them more predictable and easier to work with.
3) Arrow functions do not have their prototype property, which means they cannot be used as constructors to create new objects. Normal functions, however, have a prototype property that can be used to define methods shared by all instances created using that constructor function.
4) Arrow functions are more suitable for shorter, inline functions, such as callback functions or event handlers, due to their concise syntax. Normal functions, with their more traditional syntax, are better suited for larger, more complex functions that require more structure and readability.
5) Normal functions allow for named function declarations, which can be useful for recursion or for creating self referential functions. Arrow functions are always anonymous and cannot be named.
6) Normal functions can be hoisted, which means they can be called before they are defined in the code. Arrow functions are not hoisted and must be defined before they are called.
7) Arrow functions have implicit return statements for a single expression, making them convenient for functions with concise one liners. Normal functions require an explicit return statement to return a value.
8) Normal functions can be used as methods on objects, allowing access to the object's properties using the “this” keyword. Arrow functions do not have their own “this” binding and may not work as expected when used as object methods.
By understanding the differences between normal functions and arrow functions in JavaScript, students can leverage the strengths of each to write cleaner, more efficient code in their training programs.
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