lexical environment

There are 4 posts tagged lexical environment.

ECMA-262-5 in detail. Chapter 3.2. Lexical environments: ECMAScript implementation.

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  1. Introduction
  2. Definitions
  3. Environment record types
    1. Declarative environment record
      1. Eval and inner functions may break optimizations
    2. Object environment record
  4. Structure of execution context
    1. This binding
    2. Variable environment
    3. Lexical environment
  5. Identifier resolution
  6. Conclusion
  7. Additional literature

Introduction

In this chapter we continue our consideration of lexical environments. In the previous sub chapter 3.1 we clarified the general theory related with the topic. In particular we have learned that the concept of environments is closely related with concepts of static scope and closures. Continue reading →

ECMA-262-5 in detail. Chapter 3.1. Lexical environments: Common Theory.

  1. Introduction
  2. Common Theory
    1. Scope
      1. Static (lexical) scope
      2. Dynamic scope
        1. With and eval as dynamic scope features in ECMAScript
    2. Name binding
      1. Rebinding
      2. Mutation
    3. Environment
      1. Activation record model
      2. Environment frames model
        1. First-class functions
        2. Funargs and higher-order functions
        3. Free variable
        4. Environment definition
        5. Rules of function creation and application
        6. Closure
        7. Funarg problem
      3. Combined environment frame model
  3. Conclusion
  4. Additional literature

Introduction

In this chapter we’ll talk in detail about lexical environments — a mechanism used in some languages to manage the static scoping. In order to understand this concept completely, we’ll also discuss briefly the alternative — dynamic scoping (which though isn’t used directly in ECMAScript). We’ll see how environments help to manage lexically nested structures of a code and to provide complete support of closures. Continue reading →