Push multiple elements to array

Getting deeper: The Art of Array push

For extending arrays, JavaScript hands you a variety of tools. The spread operator tops the list with its simplicity and efficiency.

Large data handling

For bigger data sets, you might use:

• Loops: Provides you full control like a proper programmer!
• Batching with spread: A smart move to avoid stack overflow errors, which are as bad as Thanos in the Avengers universe.

Non-mutative method

In cases where the original array should not be changed, use concat as it creates a new array. It's the superpower you need to keep your data structures immutable.

Old browser compatibility

For older browser support, tools like Babel come to the rescue to support ES6 features like the spread operator.

Throwback: push.apply

Array.prototype.push.apply was the hero for adding multiple elements to an array back in ES5.

Array.prototype.push.apply(codingAvengers, aspiringAvengers);
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Though it lacks the simplicity and intuitiveness of the spread and you need to provide the context parameter explicitly.

Techniques at a glance

Technique	Syntax	Use case
Spread operator	codingAvengers.push(...avengersAssemble);	Elegant, modern, concise
concat	codingAvengers.concat(avengersAssemble);	Immutable, perfect for functional programming
Loops	avengersAssemble.forEach(hero => codingAvengers.push(hero));	Handles large data, avoids stack overflow
push.apply	Array.prototype.push.apply(codingAvengers, avengersAssemble);	Old school, but gets the job done!

Beware of pitfalls and best practices

Adopting best practices and dodging the pitfalls makes it a smooth journey.

Performance

The spread operator may lead to performance implications for massive arrays. So, keep your codebase well-balanced like a skilled tightrope walker.

Avoiding mutation

push modifies the original array, while concat creates a new one. Be aware of mutations when the Hulk is around!

The versatile spread operator

The ... spread operator can also copy arrays:

let clone = [...array]; // just like creating another Hulk!
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Or spread elements into function arguments:

Math.max(...array); // who lifts the heaviest? Let's find out.
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Readability

The spread syntax leads to less cognitive load and a cleaner codebase, making it easier for others to understand your code. Unreadable code can sometimes be a villain in the developer's life!