Ruby Programming Course > Blocks

Block Variable Scope

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Block variables are defined in the enclosing method's scope and can be accessed only in the current scope and nested scopes. A block variable can be declared as either public, private or protected. The public declaration makes it available to any nested blocks, private restricts access to just this block and protected restricts access to methods within its own class or its subclasses.

Block scoped variables: A block scoped variable is one that is only available from within the block. Even if a block is inside a function, a block scoped variable will not be available outside the block.

When a variable is declared inside a function, it can only be accessed within that function and cannot be utilised outside of it. When a variable is declared inside an if or switch condition or a for or while loop, it is only available within that condition or loop.

They can't stand on their own, unlike functions. A block is a piece of code that can be invoked in a similar way to a function, but not quite: it only occurs next to a function call like. each, and that function may or may not use that block by "invoking" it (executing the code inside it).

The main distinction is that method has a name, but block does not, and arguments to method are passed between brackets (), whereas arguments to block are passed between pipes ||. How to return values from a block: Actually, the value returned by the method on which it is called is returned by block.

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Course Content

  1. Introduction to Ruby
    2m 6s
  2. How to use LearnVern
    3m 8s

  1. What is RVM?
    7m 37s
  2. How to Install RVM & Ruby Practical
    4m 25s
  3. Assignmen of installation version
    37s
  4. RVM Functions
    3m 13s
  5. RVM Functions Practicals
    3m 12s
  6. RVM Assignment-1
    17s
  7. RVM Assignment-2
    12s

  1. Variables Introductions
    44s
  2. Local & Global Variables
    2m 31s
  3. Instance & Class Variables
    4m 2s
  4. Constant
    1m 30s

  1. Boolean
    2m 46s
  2. Numbers
    2m 28s
  3. Symbols
    3m 43s
  4. Arrays
    5m 28s
  5. Hashes
    6m 43s
  6. Strings
    2m 17s

  1. Object Oriented
    2m 26s
  2. Class & Objects
    2m 20s
  3. Initializer Method
    2m 25s
  4. Instance Method
    1m 45s
  5. Initializer Instance Method Practical
    4m 32s
  6. Assignment of Initialize Method
    38s
  7. Assignment of Instance method
    26s
  8. Class Method
    2m 19s
  9. Class Method Practical
    3m 16s
  10. Class & Methods
    5m 6s
  11. Assignment of Class Method
    24s
  12. Attribute
    4m 56s
  13. Assignment of attr_reader
    18s
  14. Assignment of attr_assessor
    16s
  15. Assignment of att_write
    17s

  1. Control_Structure Intro
    1m 17s
  2. If Else Statement
    5m 28s
  3. Assignment of If Else Statement
    31s
  4. Unless Statement
    4m 58s
  5. Case Statement
    3m 55s
  6. Assignment of Case Statement
    24s
  7. Intro + While Loop
    3m 9s
  8. Assignment of While Loop
    17s
  9. Until Loop
    3m 24s
  10. Assignment of Until Loop
    29s
  11. For Loop
    3m 45s
  12. Assignment of For Loop
    21s
  13. Break Statement
    3m 48s
  14. Assignment of Break Statement
    30s
  15. Next Statement
    3m 58s
  16. Assignment of Next Statement
    18s
  17. Redo Statement
    4m 16s
  18. Assignment of Redo Statement
    16s
  19. Assignment of Control Structure
    14s

  1. Introduction of Comments
    6m 48s
  2. Assignment of Single line Comments
    38s
  3. Assignment of Multi line Comments
    26s

  1. Arithmetic Operators
    2m 39s
  2. Arithmetic Operator Example
    8m 6s
  3. Assignment of Arithmetic Operators
    14s
  4. Assignment Operators
    3m 47s
  5. Assignment Operator Example
    2m 7s
  6. Assignment of Assignment Operator
    15s
  7. Logical Operators
    4m 18s
  8. OR Operator
    4m 9s
  9. NOT Operator
    4m 55s
  10. Comparison Operators
    5m 38s
  11. Comparison Operators Example-1
    9m 54s
  12. Comparison Operators Example-2
    9m 59s
  13. Assignment of Comparision Operators
    25s
  14. Assignment 2 of Arithmetic Operators, Comparision Operators
    13s
  15. Assignment 3 of Arithmetic Operators, Comparision Operators
    13s
  16. Assignment 5 of Arithmetic Operators, Comparision Operators
    19s
  17. Bitwise Operators
    2m 56s
  18. And Operator Example
    6m 11s
  19. OR Operator Example
    4m 7s
  20. XOR Operator
    4m 27s
  21. Assignment of Bitwise Operator
    31s
  22. Ones Complement Operator
    1m 22s
  23. Binary Left Shift Operator
    2m 59s
  24. Binary Right Shift Operator
    3m 35s
  25. Ternary Operator
    3m 14s
  26. Ternary Operator Example
    3m 12s
  27. Range Operators
    2m 2s
  28. Range Operator Example
    4m 27s
  29. Assignment of Range Operator
    19s

  1. Introduction to Array
    12m 39s
  2. Create Array
    2m 50s
  3. Access Elements from Array
    2m 2s
  4. Methods of Array
    6m 33s
  5. Add Element in Array
    3m 47s
  6. Remove Element from Array
    3m 38s
  7. Assignment of Array
    39s
  8. Assignment of Create Array
    26s
  9. Assignment of Add element
    41s

  1. Introduction of Hashes
    58s
  2. Create Hash
    5m 38s
  3. Assignment of Create Hash
    37s
  4. Access Elements from Hash
    4m 41s
  5. Methods of Hash + Key Method
    1m 47s
  6. Hash Methods of values
    2m 2s
  7. Hash Methods of clear
    2m 11s
  8. Hash Method of delete
    3m 21s
  9. Hash Methods of empty
    2m 58s
  10. Hash Methods of length
    2m 1s
  11. Hash Methods of .has key(key) OR .key(key)
    4m 1s
  12. Hash Methods of has value(value) OR .value(value)
    4m 40s
  13. Hash Method of Index(value)
    2m 59s
  14. Hash Method of Size
    1m 58s

  1. Introduction of Blocks
    8m 22s
  2. Simple Block
    2m 1s
  3. Block With Single Arguments
    2m 27s
  4. Block With Multiple Arguments
    2m 59s
  5. Assignment of Block
    58s
  6. Block Variable Scope
    5m 56s
  7. Block Local Scope Variables
    2m 56s
  8. Block Global Scope Variables
    2m 58s
  9. Assignment of Block Variable
    47s

  1. Introduction of Exception
    1m 23s
  2. Handling Exceptions
    4m 22s
  3. Handling Exceptions Example
    8m 43s
  4. Assignment of Handling Exceptions
    30s
  5. Retry Statement
    2m 59s
  6. Retry Statement Example
    3m 22s
  7. Ensure Statement
    2m 37s
  8. Ensure Statement Example
    4m 7s
  9. Exceptions Assignment-2
    22s
  10. Exceptions Assignment-3
    20s
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