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2025-01-25 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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Today, the editor will share with you the relevant knowledge points about how to use the new arrow function in ES6. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.
The syntax of arrow function expressions is more concise than that of ordinary function expressions.
(parameter 1, parameter 2, … , parameter N) = > {function declaration}
(parameter 1, parameter 2, … , parameter N) = > expression (single)
/ / equivalent to: (parameter 1, parameter 2, … , parameter N) = > {return expression;}
When there is only one parameter, parentheses are optional:
(single parameter) = > {function declaration}
Single parameter = > {function declaration}
Functions with no arguments should be written as a pair of parentheses:
() = > {function declaration}
Case study
/ / ES5
Var x=function (XBI y) {
Return Xeroy
}
/ / ES6
Const x = (x _ ray y) = > x _ ray
Some arrow functions do not have their own this. A method that is not suitable for defining an object.
When we use the arrow function, the arrow function binds the value of the outer this for us by default, so the value of this in the arrow function is the same as the outer this.
The arrow function cannot be promoted, so it needs to be defined before using it.
Using const is safer than using var, because a function expression is always a constant.
If the function part is just a statement, you can omit the return keyword and curly braces {}, which is a good habit:
Case study
Const x = (xQuery y) = > {return Xeroy}
These are all the contents of this article entitled "how to use the new arrow function in ES6". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.
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