I was once asked in an interview if I could create a polyfill for the push() method in JavaScript. Does anyone have any tips on how this can be accomplished?
I was once asked in an interview if I could create a polyfill for the push() method in JavaScript. Does anyone have any tips on how this can be accomplished?
push() is a method in JavaScript that appends one or more elements to the end of an array and returns the new length of the array. You can simply use the array's length property to add an element at the end.
if (!Array.prototype.push) {
// Check if not already supported, then only add. No need to check this when you want to Override the method
// Add method to prototype of array, so that it can be directly called on an array
Array.prototype.push = function() {
// Using a loop for adding multiple elements
for (var i = 0; i < arguments.length; i++) {
this[this.length] = arguments[i];
}
// Return the new length of the array
return this.length;
};
}
if the method push is not supported by Array prototype yet {
redefine Array prototype.push = function {
loop through arguments and add them to the end of array;
if the type of this array is object, increment its length;
return the new length of the array;
};
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