== Why is this an issue?

Use a ``+`` with two numbers and you'll get addition. But use it with a string and anything else, and you'll get concatenation. This could be confusing, especially if it's not obvious that one of the operands is a string. It is recommended to explicitly convert the non-string component to make it easier to understand to future maintainers.


This rule raises an issue when ``+`` or ``+=`` is used with a string and a non-string.


=== Noncompliant code example

[source,javascript]
----
function foo() {
  let x = 5 + 8;  // okay
  let z = "8"
  return x + z;  // Noncompliant; yields string "138"
}
----


=== Compliant solution

[source,javascript]
----
function foo() {
  let x = 5 + 8;
  let z = "8"
  return x + Number(z);
}
----


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