+= operator is a shorthand for the addition assignment operator. It is used to add a value to a variable. The value can be an integer, floating point number, string, or object.
The addition assignment or the
+= operator does the addition and assignment in a single operation.
To learn how it works, let’s first try to separate the assignment and the increment.
let a = 1; a = a + 2; console.log(a);
The example above creates the variable
a equal to
1 and then increments the value of it by
This example can be rewritten using the
let a = 1; a += 2; console.log(a);
The output remains the same: