What is the best way to write code following this rule?
let exampleArray = [...];
for (let j = 0, k = exampleArray.length; j < k; j++) {
...
}
What is the best way to write code following this rule?
let exampleArray = [...];
for (let j = 0, k = exampleArray.length; j < k; j++) {
...
}
This piece of advice has become a classic in the world of JavaScript.
The tsLint rule is specifically crafted to prioritize readability within your code.
Many individuals typically store the length of an array in a variable believing it brings a performance advantage. However, if this is the sole reason behind doing so, the minimal performance boost may not outweigh the loss in readability (and when I personally tested it on JSPerf, it was actually slower).
Hence, this represents the standard "tsLint recommended solution"...
for (let i = 0; i < someArray.length; i++) {
In JavaScript, accessing the length property does not result in iterating through the entire array, making the impact negligible.
If you hold a different perspective, you have the option to disable the rule - here's how you can do it with a comment:
/* tslint:disable:one-variable-per-declaration */
Alternatively, you can achieve this via configuration settings:
"one-variable-per-declaration": false
Or you may choose to utilize the configuration flag that deactivates it solely for for loops:
"one-variable-per-declaration": [true, "ignore-for-loop"]
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