var question = { search: "toto" };
typeof question.search
question.search
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
typeof | |
access |
Test name | Executions per second |
---|---|
typeof | 5395660.5 Ops/sec |
access | 5331210.0 Ops/sec |
Let's break down what's being tested in the provided JSON.
Benchmark Definition
The benchmark definition is a simple JavaScript expression: typeof question.search
. This expression tests the behavior of the typeof
operator when applied to a property value on an object (question.search
).
In essence, the benchmark is checking how quickly different browsers can evaluate this expression. The result will show which browser executes the typeof
check faster.
Options Compared
Two options are compared in this benchmark:
typeof
operator: This is a built-in JavaScript operator that returns a string indicating the type of its operand.question.search
): This option accesses the search
property directly on the question
object.Pros and Cons
typeof
operator has pros:question.search
) has cons:search
property doesn't exist on the object, it will throw a TypeError. However, in some cases, accessing the property and then checking its type with typeof
can be faster.search
property is very large or complex, accessing it directly might take longer.Library
In this benchmark, there is no explicit library being used (i.e., no external dependencies). However, JavaScript engines like V8 in Chrome execute and optimize the code in various ways, which might be influenced by internal libraries or optimizations.
Special JS Feature or Syntax
There doesn't appear to be any special JavaScript feature or syntax being tested here. The benchmark is focused on a simple property access and typeof
operator combination.
Other Alternatives
Other approaches could include:
isType()
from the Lodash library.question['search']
) or the optional chaining operator (?.
).Keep in mind that these alternatives would require significant changes to the benchmark code and might not be relevant for this specific test case.