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Programming Errors

8 errors

Common programming errors — syntax errors, type errors, name errors, and logic mistakes.

8 / 8

  1. 1

    Syntax Error

    Your code has a structural problem — a missing bracket, quote, or punctuation that makes it impossible to parse.

  2. 2

    Type Error

    You tried to use a value in a way that doesn't match its type — like calling `len()` on a number or adding a string to an integer.

  3. 3

    Name Error

    You referenced a name (variable, function, class) that doesn't exist in the current scope.

  4. 4

    Undefined Variable

    The variable exists but has no value — it is `undefined`, and using it as if it has one causes problems.

  5. 5

    Null Value Problem

    You operated on a value that is `null` — calling a method or reading a property on `null` causes an error.

  6. 6

    Infinite Loop

    Your loop never stops — the condition that should end it is always true or the loop variable never changes.

  7. 7

    Wrong Condition

    Your condition evaluates to the wrong true/false value, so your code takes the wrong path or loops the wrong number of times.

  8. 8

    Index Out of Range

    You tried to read or write a position in an array that is outside its valid range of indices.

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