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Array.indexOf vs String.indexOf vs Object lookup operators
(version: 0)
Comparing performance of:
Array indexOf vs String indexOf vs Object lookup
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var o = {'++':0, '--':1, '!=':2, '<<<':3, '>>':4}; var a = ['++', '--', '!=', '<<<', '>>']; var s = '++--!=<<<>>'; var t = '<<<';
Tests:
Array indexOf
var i = a.indexOf(t);
String indexOf
var i = s.indexOf('-' + t + '-');
Object lookup
var i = o[t];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Array indexOf
String indexOf
Object lookup
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided JSON represents a JavaScript microbenchmark created on MeasureThat.net. The benchmark compares the execution times of three different operators: `Array.indexOf`, `String.indexOf`, and `Object.lookup`. These operators are used to find the index of a specific element within an array, string, or object. **Options Compared** 1. **Array.indexOf**: This operator searches for the specified element in the array from left to right and returns its first occurrence. 2. **String.indexOf**: This operator searches for the specified character or substring in the string from left to right and returns its first occurrence. 3. **Object.lookup (or Object["key"])**: This operator uses bracket notation to access a property of an object by name. **Pros and Cons** * **Array.indexOf**: * Pros: Efficient for arrays with unique elements, can be faster than `String.indexOf` and `Object.lookup`. * Cons: May not find the last occurrence, and its performance can degrade if the array is large or contains many duplicate values. * **String.indexOf**: * Pros: Can find the last occurrence of a character or substring in a string, relatively efficient for strings with unique characters. * Cons: Slower than `Array.indexOf` for arrays and may be less efficient for very long strings due to the need to scan from left to right. * **Object.lookup (or Object["key"])**: * Pros: Fast access to properties of objects by name, can be used with both keys that exist in the object and those that do not. * Cons: May throw an error if the key does not exist, and its performance is generally slower than `Array.indexOf` due to the overhead of resolving the property. **Library Usage** None of the operators rely on any external libraries. They are built-in JavaScript functions. **Special JS Features or Syntax** The benchmark uses the following special JavaScript features: * **Bracket notation**: The `Object.lookup` operator uses bracket notation (`o[t]`) to access properties of an object by name. * **Template literals**: The `String.indexOf` test case uses template literals (`s = '++--!=<<<>>';`) to create a string with embedded expressions. **Alternative Approaches** In addition to the three operators being compared, alternative approaches for finding the index of an element in an array or string include: * **Linear search**: A simple iterative approach that scans through the elements of an array or string until it finds a match. * **Binary search**: An efficient algorithm for searching sorted arrays, which can be faster than linear search but requires the array to be sorted. In general, `Array.indexOf` is a good choice when you need to find the first occurrence of an element in an array. `String.indexOf` and `Object.lookup` are better suited for finding the index of a character or property within a string or object.
Related benchmarks:
Array.indexOf vs String.indexOf
index vs lastindexof (last index)
String.indexOf vs String.indexOf with the second parameter
String.indexOf(char) vs String.indexOf(char, position)
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