js ?. Assignment operator - Code World

js ?. Assignment operator

Others 2021-03-22 11:29:20 views: null

作用:若?.属性为undefined,则会将x?.属性整个表达式作为undefined,而不是去报错

Code example:

//没用.name属性会将前面整个表达式作为undefined,代码会继续运行,不加?会报错停止
users.find((user) => user.id === item.id)?.name||'未知'

Guess you like

Origin blog.csdn.net/weixin_43294560/article/details/114854044

JS base assignment operator _

js ?. Assignment operator

js assignment, relationship, equality, conditional operator

Assignment operator

operator, assignment operator

operator, assignment operator

02 assignment operator, member operator

The usage and meaning of [optional chain (.?)], [null value coalescing operator (??)], [null value assignment operator (??=)] of js

Enhanced in python assignment operator

Enhanced assignment operator

java assignment operator

c ++ overload the assignment operator

What is php assignment operator?

Constructor / destructor / assignment operator (a)

python assignment operator 200308

Java assignment operator execution

About overloading of assignment operator "="

Some useful js shortcut operations: optional chaining operator, null value merging operator, null value assignment operator, non-null assertion operator, expansion and remainder operator, destructuring

Arithmetic operator +-x/%++/assignment operator=/comparison operator＞<=/logic operator!&&||

C++ assignment operator and assignment expression

Java SE (20) operator-assignment operator

Optional chaining operator ?. and null assignment operator ??

JS operators - arithmetic operators, logic operators, assignment operators, relational operators, conditional operator

EduCoder_web training assignment--JavaScript learning manual 3: JS operator

Chapter: 08 Operator [assignment operators]

Constructor / destructor / assignment operator (II)

C++ assignment operator function

C# assignment operator and analysis

C++ assignment overloaded operator

1. Assignment operator function

Recommended

Ranking

error: (-215:Assertion failed) !_img.empty() in function ‘cv::imwrite‘

Database migration between Navicat servers

Minimum number of rotation of the array: Array

balenaEtcher for mac (make a boot disk software) v1.5.67

Custom processing serialization and deserialization in jackson

Mu-en-mask system development software

Mastering Regular Expressions

Find mileage Java--

Web pages can not directly concern the public micro-channel number how to do? A key to arouse public concern number of micro-channel solutions

[CodeForces - 739B] Alyona and a tree Tree + [difference] + bipartite

Daily

More

2024-05-12(28)

2024-05-11(32)

2024-05-10(34)

2024-05-09(32)

2024-05-08(18)

2024-05-07(34)

2024-05-06(6)

2024-05-05(0)

2024-05-04(18)

2024-05-03(8)