Short-Circuiting Assignment Operators

Short-Circuiting Assignment Operators

&&=, ||=, and ??=.

code:ts

// could be 'a ||= b'

if (!a) {

a = b;

}

code:ts

let values: string[];

(values ?? (values = [])).push("hello");

// After

(values ??= []).push("hello");

code:ts

obj.prop ||= foo();

// roughly equivalent to either of the following

obj.prop || (obj.prop = foo());

if (!obj.prop) {

obj.prop = foo();

}