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  1. Rules Repository
  2. RSPEC-3785

"in" should not be used with primitive types

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    Details

    • Type: Bug Detection
    • Status: Active
    • Resolution: Unresolved
    • Labels:
      None
    • Message:
      TypeError can be thrown as this operand might have primitive type.
    • Highlighting:
      Hide

      Primary: The right operand.
      Secondary: the operator.

      Show
      Primary: The right operand. Secondary: the operator.
    • Default Severity:
      Critical
    • Impact:
      High
    • Likelihood:
      Low
    • Default Quality Profiles:
      Sonar way, Sonar way recommended
    • Covered Languages:
      JavaScript
    • Remediation Function:
      Constant/Issue
    • Constant Cost:
      5min
    • Analysis Scope:
      Main Sources, Test Sources

      Description

      The in operator tests whether the specified property is in the specified object.
      If the right operand is a of primitive type (i.e., not an object) the in operator raises a TypeError.

      Noncompliant Code Example

      var x = "Foo";
      "length" in x; // Noncompliant: TypeError
      0 in x;        // Noncompliant: TypeError
      

      Compliant Solution

      var x = new String("Foo");
      "length" in x;    // true
      0 in x;           // true
      "foobar" in x;    // false
      

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            Assignee:
            Unassigned Unassigned
            Reporter:
            jeanchristophe.collet Jean-Christophe Collet (Inactive)
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              Dates

              Created:
              Updated: