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Purecode | Cloning Objects and Arrays
When it comes to cloning objects or arrays, the spread operator comes to the rescue. It allows us to create a shallow clone of an array by distributing an existing array’s elements into a new array. Remember, it creates only a shallow copy, so nested objects or arrays will still reference their original counterparts.
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PureCode AI review | Combining Arrays
The spread operator serves as a handy tool for joining and cloning arrays. It simplifies the process of merging multiple arrays in JavaScript, making the array combination process a breeze.
The Power of the Spread Operator | PureCode company
The spread operator (…) is one of the most powerful shorthands in JavaScript. It simplifies the process of combining multiple arrays into one and easily copies array elements.
How Spread Operator Update Immutabile Objects and Arrays
You can think of the rest parameter like the opposite of the spread operator; if the spread operator is like unboxing all of the contents of a package, then the rest parameter is like taking all the contents and putting them back into the package.
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Last week I wrote 6 Great Uses of the Spread Operator, a post detailing how awesome the spread operator (...) is for working with arrays and other iterable objects. As always my readers chimed in with a few other great uses and which you should check out in the comments. And of course as soon as I publish the post I find another great use of the spread operator while I tinker with Babel and React: merging multiple objects' properties into one object!
Thanks to ES6 and the likes of Babel, writing JavaScript has become incredibly dynamic, from new language syntax to custom parsing like JSX. I've become a big fan of the spread operator, three dots that may change the way you complete tasks within JavaScript.
test the examples in the console!
Calling Functions without Apply
Combine Arrays
Copying Arrays
Convert arguments or NodeList to Array
Using Math Functions
Destructuring Fun
Convert arguments or NodeList to Array
Much like copying arrays, we've used Array.Prototype.slice to convert NodeList and arguments objects and to true arrays, but now we can use the spread operator to complete that task:
[...document.querySelectorAll('div')]
The Axel Rauschmayer has 2 more (see comments)
Convert iterables to Arrays (not just arguments and NodeList):
> [...new Map().set(true, 'yes').set(false, 'no')] [ [ true, 'yes' ], [ false, 'no' ] ]
❤ Eliminate duplicates from an Array:
> const arr = [7, 3, 1, 3, 3, 7]; > [...new Set(arr)] [ 7, 3, 1 ]
Spread operator in JavaScript
Spread operator in JavaScript
I loved the new spread operator of javascript that came with ES6. Basically, it has tree dots. You might be familiar with the varagrs of Java. However, it’s more than varargs. Let me give you some examples-
Let’s say you have a variable-
var a= [1,2,3,4]; var b = [5,7];
and you wanna concatenate a and b . There is a function to do that –
var d = a.concat(b) ; console.log(d); Output: [1, 2, 3,…
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