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if vs ||
(version: 1)
Comparing performance of:
if case vs or case
Created:
one year ago
by:
Guest
Go to the latest result
Tests:
if case
const a = "foo"; let b; if (!a) { b = "bar"; }
or case
const a = "foo"; const b = a || "bar";
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
if case
or case
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:131.0) Gecko/20100101 Firefox/131.0
Browser/OS:
Firefox 131 on Ubuntu
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<iframe src="https://measurethat.net/Embed?id=564326" width="100%" height="500px"></iframe>
or case
1500.4M/s
if case
1494.5M/s
View exact numbers
Test name
Executions per second
✓
or case
1,500,363,776 Ops/sec
if case
1,494,478,592 Ops/sec
Autogenerated LLM Summary
(model
gpt-4o-mini
, generated one year ago):
### Benchmark Overview The benchmark defined here compares two different JavaScript approaches for conditional assignment of values: using an `if` statement and using the logical OR (`||`) operator. The goal is to measure which approach performs better in terms of execution speed. ### Options Compared 1. **If Case** - **Code**: ```javascript const a = "foo"; let b; if (!a) { b = "bar"; } ``` - **Description**: This approach uses a standard conditional statement to check if `a` is falsy. If `a` is falsy, `b` is assigned the value "bar". In this case, since `a` is a non-empty string, `b` will remain undefined. 2. **Or Case** - **Code**: ```javascript const a = "foo"; const b = a || "bar"; ``` - **Description**: This approach uses the logical OR operator. It evaluates `a`; if `a` is truthy (non-empty string, in this case), `b` takes the value of `a`. If `a` were falsy, `b` would be assigned "bar". ### Pros and Cons of Each Approach #### If Case - **Pros**: - Clear and explicit control flow, making it more understandable for those unfamiliar with less common JavaScript idioms. - Allows for more complex conditional logic and statements if needed in the future. - **Cons**: - Slightly more verbose and may incur a minor performance overhead compared to the logical operator approach. - If the condition it checks does not change often, this can lead to unnecessary checks in performance-critical sections. #### Or Case - **Pros**: - More concise and can lead to cleaner code, especially when dealing with straightforward fallbacks. - In many scenarios, it can be marginally faster since it does not involve the overhead of a conditional jump. - **Cons**: - Less explicit when compared to the `if` statement; developers may need to be familiar with the behavior of logical operators in JavaScript. - If `a` can sometimes require additional validation or processing, the concise syntax may hide that behavior. ### Execution Results The benchmark results showed that both approaches delivered high execution speeds, with the `or case` performing slightly better: - **If Case**: 1,494,478,592.0 executions per second - **Or Case**: 1,500,363,776.0 executions per second The `or case` was faster, though both approaches remained efficient. ### Other Considerations #### Context of Use - The choice between these two structures may often hinge on the readability and maintainability of the code rather than raw performance, especially in larger applications. - Use cases may vary: if developers expect various conditions and values to be checked or assigned, the `if` statement provides clarity. Conversely, if defaults are straightforward, the `or` operator is appropriate. ### Alternatives Other alternatives can be considered depending on the requirements of the code: 1. **Ternary Operator**: ```javascript const b = a ? a : "bar"; ``` This offers a compact form similar to the `if` case. 2. **Nullish Coalescing Operator (`??`)** (ES2020): ```javascript const b = a ?? "bar"; ``` This approach only defaults to "bar" if `a` is `null` or `undefined`, which can be beneficial in cases where falsy values like empty strings or zero should be preserved. In conclusion, understanding the differences between these coding patterns, along with their performance implications, helps software engineers make informed design choices in their JavaScript programs.
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