Polyfills are essential tools for developers aiming to create web applications compatible with a wide range of browsers. These code snippets bridge the gap between modern functionalities and older browser limitations.
Today, we'll delve into the call() function and explore how to implement a polyfill for it, ensuring your applications function seamlessly across different browser environments.
Given below is a line by line explanation of the code.
The call() method in JS invokes a function with a specified "this" value and allows passing arguments individually.
Ln:1, person is an object.
Ln:5, printAge is a function, that takes age as an arg. (Call method can take N number of arguments).
4.Ln:9, Function.prototype.myCall is our polyfill that handles the call method. It takes the object and arguments.
Ln:10, we now make a key in the object naming it fn and assigning "this" to it. "this" refers to the printAge function() here.
Ln:11 we call the function with the arguments.
Ln:14, we call the myCall method here and get to see our output in the console.
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