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In JavaScript, the semicolon (;) is optional as a statement separator, but omitting semicolons can be confusing, and lead to unexpected results because a semicolon is implicitly inserted at the end of each line.
Noncompliant Code Example

function fun() {
  return  // Noncompliant. ';' implicitly inserted at end of line
       5   // Noncompliant. ';' implicitly inserted at end of line
}
print(fun());  // prints "undefined", not "5"

Compliant Solution

function fun() {
  return 5;
}
print(fun());