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Switch vs Object Literal value return
(version: 0)
return primitive values instead of functions
Comparing performance of:
Switch vs Object Literal
Created:
3 years ago
by:
Guest
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Script Preparation code:
var str = 'abc'; str = str.charAt(Math.floor(Math.random() * 3));
Tests:
Switch
const getString = (randomString) => { switch (randomString) { case 'a': return 'a'; case 'b': return 'b'; case 'c': return 'c'; case 'd': return 'd'; case 'e': return 'e'; case 'f': return 'f'; case 'g': return 'g'; case 'h': return 'h'; case 'i': return 'i'; case 'j': return 'j'; default: { return 'default'; } } }; console.log(getString(str));
Object Literal
const objectLiteral = { a: 'a', b: 'b', c: 'c', d: 'd', e: 'e', f: 'f', g: 'g', h: 'h', i: 'i', j: 'j', }; console.log(objectLiteral[str] || 'default');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Switch
Object Literal
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview** The provided JSON represents a benchmark test case on MeasureThat.net, which compares the performance of two approaches for returning values from an array: using a `switch` statement versus object literals. **Benchmark Definition** The benchmark definition specifies that users should create and run JavaScript microbenchmarks to measure the performance difference between these two approaches. The script preparation code is provided as a starting point, where a random string `str` is assigned to the variable, and then its value is modified using `charAt()` to simulate different cases. **Options Compared** Two options are compared: 1. **Switch**: This approach uses a `switch` statement to evaluate the random string `str` and return the corresponding value. 2. **Object Literal**: This approach uses an object literal (`objectLiteral`) to store values that correspond to each possible input, and then accesses the desired value using bracket notation (`objectLiteral[str] || 'default'`). **Pros and Cons** ### Switch Pros: * Simple and straightforward implementation * Can be easily extended to support more cases Cons: * May incur higher overhead due to the number of cases evaluated * Can lead to slower performance due to the overhead of evaluating each case ### Object Literal Pros: * Efficient lookup using bracket notation * Can avoid the overhead of evaluating multiple cases Cons: * Requires a larger upfront investment in terms of code and data structures (object creation) * May be less flexible than switch for handling large numbers of cases **Library/Functionality Used** In this benchmark, no external libraries are used. However, `Math.random()` is used to generate a random string. **Special JavaScript Features/Syntax** The benchmark uses the following special syntax: * Bracket notation (`[str]`) for accessing object values * Template literals (`const objectLiteral = { ... }`) for defining an object literal These features are widely supported in modern JavaScript engines, but may require additional setup or configuration in older browsers. **Alternatives** Other alternatives to consider when returning values from an array include: * Using a `Map` data structure instead of objects or switch statements * Implementing a custom lookup table using an array and indexing * Utilizing a library like Lodash or Underscore.js for optimized string manipulation and object lookup Note that the choice of alternative will depend on the specific requirements and constraints of your project.
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