+= operator is used to add a value to a variable. For example:
let x = 5;x += 3; // x is now equal to 8
let str = "Hello";str += " World"; // str is now equal to "Hello World"
In the above example, the
+= operator is used to concatenate the string "World" to the end of the string "Hello".
+= operator is a convenient shorthand for adding a value to a variable and reassigning the result to that variable. It is equivalent to writing
x = x + y, where
x is the variable and
y is the value to be added.