useFlatMap
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Summary
Section titled “Summary”- Rule available since:
v1.0.0 - Diagnostic Category:
lint/complexity/useFlatMap - This rule is recommended, which means is enabled by default.
- This rule has a safe fix.
- The default severity of this rule is information.
- Sources:
- Same as
unicorn/prefer-array-flat-map - Same as
map_flatten
- Same as
How to configure
Section titled “How to configure”{ "linter": { "rules": { "complexity": { "useFlatMap": "error" } } }}Description
Section titled “Description”Promotes the use of .flatMap() when map().flat() are used together.
Examples
Section titled “Examples”Invalid
Section titled “Invalid”const array = ["split", "the text", "into words"];array.map(sentence => sentence.split(' ')).flat();code-block.js:2:1 lint/complexity/useFlatMap FIXABLE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ The call chain .map().flat() can be replaced with a single .flatMap() call.
1 │ const array = [“split”, “the text”, “into words”];
> 2 │ array.map(sentence => sentence.split(’ ‘)).flat();
│ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
3 │
ℹ Safe fix: Replace the chain with .flatMap().
1 1 │ const array = [“split”, “the text”, “into words”];
2 │ - array.map(sentence·=>·sentence.split(’·‘)).flat();
2 │ + array.flatMap(sentence·=>·sentence.split(’·’));
3 3 │
const array = ["split", "the text", "into words"];array.map(sentence => sentence.split(' ')).flat(1);code-block.js:2:1 lint/complexity/useFlatMap FIXABLE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ The call chain .map().flat() can be replaced with a single .flatMap() call.
1 │ const array = [“split”, “the text”, “into words”];
> 2 │ array.map(sentence => sentence.split(’ ‘)).flat(1);
│ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
3 │
ℹ Safe fix: Replace the chain with .flatMap().
1 1 │ const array = [“split”, “the text”, “into words”];
2 │ - array.map(sentence·=>·sentence.split(’·‘)).flat(1);
2 │ + array.flatMap(sentence·=>·sentence.split(’·’));
3 3 │
const array = ["split", "the text", "into words"];array.map(sentence => sentence.split(' ')).flat(2);Related links
Section titled “Related links”Copyright (c) 2023-present Biome Developers and Contributors.