Spread Js Vue
🔞 ALL INFORMATION CLICK HERE 👈🏻👈🏻👈🏻
Spread Js Vue
Select your preferred language English (US) Български Deutsch Español Français Italiano 日本語 한국어 Polski Português (do Brasil) Русский Українська 中文 (简体) 正體中文 (繁體) Change language
Rest parameters (also
‘ ... ’)
Function.prototype.apply() (also ‘ ... ’)
Spread syntax ( ... ) allows an iterable such as an array
expression or string to be expanded in places where zero or more arguments (for
function calls) or elements (for array literals) are expected, or an object expression
to be expanded in places where zero or more key-value pairs (for object literals) are
expected.
Spread syntax can be used when all elements from an object or array need to be included
in a list of some kind.
In the above example, the defined function takes x , y , and
z as arguments and returns the sum of these values. An array value is also
defined.
When we invoke the function, we pass it all the values in the array using the spread
syntax and the array name — ...numbers .
If the array contained more than three numbers, e.g. [1, 2, 3, 4] , then it
would still work fine, except that all four would be passed, but only the first three
would be used unless you added more arguments to the function, e.g.:
The above example is somewhat rigid; the real value in spread syntax is that it works
with the same value, no matter how many elements are contained in the object, array,
etc.
It is commonly used when you want to add a new item to a local data store, or display
all stored items plus a new addition. A very simple version of this kind of action
could look like so:
In the above example you can rerun the last line as many times as you like, to keep
adding an additional 12 to the end of the array.
For object literals (new in ECMAScript 2018):
Rest syntax looks exactly like spread syntax. In a way, rest syntax is the opposite of
spread syntax. Spread syntax "expands" an array into its elements, while rest syntax
collects multiple elements and "condenses" them into a single element. See
rest parameters .
It is common to use Function.prototype.apply() in cases where you want to
use the elements of an array as arguments to a function.
With spread syntax the above can be written as:
Any argument in the argument list can use spread syntax, and the spread syntax can be
used multiple times.
When calling a constructor with new it's not possible to
directly use an array and apply() ( apply()
does a [[Call]] and not a [[Construct]] ). However, an array
can be easily used with new thanks to spread syntax:
To use new with an array of parameters without spread syntax, you would
have to do it indirectly through partial application:
Without spread syntax, to create a new array using an existing array as one part of it,
the array literal syntax is no longer sufficient and imperative code must be used
instead using a combination of push() ,
splice() , concat() , etc. With spread syntax this becomes much more succinct:
Just like spread for argument lists, ... can be used anywhere in the array
literal, and may be used more than once.
Note: Spread syntax effectively goes one level deep while copying
an array. Therefore, it may be unsuitable for copying multidimensional arrays, as
the following example shows. (The same is true with Object.assign()
and spread syntax.)
Array.prototype.concat() is often used to concatenate an array to the end
of an existing array. Without spread syntax, this is done as:
Array.prototype.unshift() is often used to insert an array of values at
the start of an existing array. Without spread syntax, this is done as:
Note: Unlike unshift() , this creates a new
arr1 , and does not modify the original arr1 array
in-place.
The Rest/Spread
Properties for ECMAScript proposal (ES2018) added spread properties to
object literals . It copies own
enumerable properties from a provided object onto a new object.
Shallow-cloning (excluding prototype) or merging of objects is now possible using a
shorter syntax than Object.assign() .
Note that Object.assign() triggers setters , whereas spread syntax doesn't.
Note that you cannot replace or mimic the Object.assign() function:
In the above example, the spread syntax does not work as one might expect: it spreads
an array of arguments into the object literal, due to the rest parameter.
Objects themselves are not iterable, but they become iterable when used in an Array, or
with iterating functions such as map() , reduce() , and
assign() . When merging 2 objects together with the spread operator, it is
assumed another iterating function is used when the merging occurs.
Spread syntax (other than in the case of spread properties) can be applied only to iterable
objects:
When using spread syntax for function calls, be aware of the possibility of exceeding
the JavaScript engine's argument length limit. See apply() for more details.
BCD tables only load in the browser
Last modified: Jan 9, 2021 , by MDN contributors
© 2005- 2021 Mozilla and individual contributors. Content is available under these licenses .
A Beginners Guide to using the Spread Operator in JavaScript | Medium
Spread syntax (...) - JavaScript | MDN
GitHub - ijse/ vue -props: spread object properties for components
JavaScript Spreadsheet Library | JS Excel Functions and Formulas | SpreadJS
Vue . js - The Progressive JavaScript Framework
< component v-for =" comp in cList "
:is =" comp.type "
v-props =" comp.props " >
© 2021 GitHub, Inc.
Terms
Privacy
Security
Status
Docs
Contact GitHub
Pricing
API
Training
Blog
About
Spread props object for vue component.
or just download build/vue-props.min.js .
spread object properties for components
Dorcelclub Mariska Executive Secretary
Www Massage Sex Com
Sensual Adventures Sex
Naughty America Femdom
Hard Porn Double Penetration
