Polyfill for map function in JavaScript
JavaScript's map function is widely used for iterating over arrays and applying a transformation to each element. However, if you're working with older browsers or environments that don't support map, you can create your own polyfill.
Step 1: It is a function : create a normal function with the name 'myMap' as below
Step 2: This function takes callback function 'callback' as parameter
Step3: array.map() doesn't affect original array. So create a new array 'output' and return the newly created array.
Step 4: Map operates on each element of the array. So loop through each element using for loop
Step 5: When each element of original array is mapped,push the modified value into 'output' array to return it.
Step 5: The callback function acts on each value of the passed array(this)
Top comments (1)
Unfortunately, this polyfill does not provide all of the functionality of the built-in JS
map, and could potentially cause issues if you were to use it. You're missing the optionalthisArgparameter.