I am seeking clarification on the meaning and practical application of this particular expression.
((identifier:string) => myFunction(identifier))('Hi')
myFunction
const myFunction = (str:string) => { console.log(str) }
The output displayed in the console:
Hi
((parameterInput:string) => myFunction(parameterInput))('Hello')This code snippet showcases a self-invoking anonymous function, which takes a single parameter called parameterInput and passes the value 'Hello' to it.
In general, the syntax for a self-invoking anonymous function looks like this:
(() => {})(). The outer parentheses encapsulate the anonymous function, while () => {} represents the actual function, and () invokes it with any necessary parameters.
Self-invoking anonymous functions can be handy for executing a top-level function when a script is loaded and parsed. However, using caution is advised as they may impact initial page loading speed if not used carefully. It's typically better practice to assign the anonymous function to a variable or define a named function instead of cluttering your code with self-invoking constructs for the sake of readability and maintainability.
(name:string) => functionName(name)name of type string and returns the result after applying functionName.call('Hello') represents calling the function call with the argument 'Hello'.call mentioned in 2. is defined directly within the example from 1.Essentially, it can be expressed as below:
const functionName = (msg:string) => { console.log(msg) }
const functionTwo = (name:string) => functionName(name)
functionTwo('Hello') //⇒ Hello
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