He/him, developer, builder of things both tangible and abstract, practitioner of yoga and ukulele... All-around complicated monkey.
https://www.buymeacoffee.com/tobyplaystheuke
I tend to think of the spread operator as being on the right side of an assignment, and the rest operator as being on the left... but it can get foggy:
Actually, Rest and Spread are part of one umbrella but working is Opposite to each ohter. In short:
The three dots in JavaScript are the spread / rest operator. The spread syntax allows an expression to be expanded in places where multiple arguments are expected.
The rest parameter syntax is used for functions with a variable number of arguments. The spread / rest operator for arrays was introduced in ES6
Rest Operator: collects all remaining elements or rest Item into an array.
When used in function arguments of a function declaration/expression it will convert
the remaining arguments into an array. This variant is called the Rest parameters
syntax.
function rest(first, second, ...remainder) {
console.log(remainder);
}
// 30, 40 ,50 are the remaining parameters and will be
// merged together in to an array called remainder
rest(10, 20, 30, 40, 50);
He/him, developer, builder of things both tangible and abstract, practitioner of yoga and ukulele... All-around complicated monkey.
https://www.buymeacoffee.com/tobyplaystheuke
my own lazy understanding, rest happens on the assignment (left-hand) side, while spread happens on the evaluation (right-hand) side. Any time we're ... in an assigment to something (like a parameter), we're using rest.
He/him, developer, builder of things both tangible and abstract, practitioner of yoga and ukulele... All-around complicated monkey.
https://www.buymeacoffee.com/tobyplaystheuke
lol I love finding things that are elegant, clear, and concise. It says exactly what it's doing, from the parameter signature to the return. Makes me happy. :D
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I tend to think of the spread operator as being on the right side of an assignment, and the rest operator as being on the left... but it can get foggy:
In this case, we're using the rest operator, but we're implicitly spreading the string into an array!
Actually, Rest and Spread are part of one umbrella but working is Opposite to each ohter. In short:
Rest Operator: collects all remaining elements or rest Item into an array.
When used in function arguments of a function declaration/expression it will convert
the remaining arguments into an array. This variant is called the Rest parameters
syntax.
Will cover in deep in future blogs.
Cheers!!
my own lazy understanding, rest happens on the assignment (left-hand) side, while spread happens on the evaluation (right-hand) side. Any time we're
...in an assigment to something (like a parameter), we're using rest.Yes, I have the same understanding.
That's such a clever one liner
lol I love finding things that are elegant, clear, and concise. It says exactly what it's doing, from the parameter signature to the return. Makes me happy. :D