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unist-util-map
Advanced tools
Readme
unist utility to create a new tree by mapping all nodes with a given function.
This is a small utility that helps you make new trees.
You can use this utility to create a new tree by mapping all nodes with a given
function.
Creating new trees like this can lead to performance problems, as it creates
new objects for every node.
When dealing with potentially large trees, and relatively few changes, use
unist-util-visit
(or
unist-util-visit-parents
) instead.
To remove certain nodes, you can also walk the tree with unist-util-visit
, or
use unist-util-filter
(clones the tree instead of
mutating) or unist-util-remove
(mutates).
To create trees, use unist-builder
.
This package is ESM only. In Node.js (version 16+), install with npm:
npm install unist-util-map
In Deno with esm.sh
:
import {map} from 'https://esm.sh/unist-util-map@4'
In browsers with esm.sh
:
<script type="module">
import {map} from 'https://esm.sh/unist-util-map@4?bundle'
</script>
import {u} from 'unist-builder'
import {map} from 'unist-util-map'
const tree = u('tree', [
u('leaf', 'leaf 1'),
u('node', [u('leaf', 'leaf 2')]),
u('void'),
u('leaf', 'leaf 3')
])
const next = map(tree, function (node) {
return node.type === 'leaf'
? Object.assign({}, node, {value: 'CHANGED'})
: node
})
console.dir(next, {depth: undefined})
Yields:
{
type: 'tree',
children: [
{type: 'leaf', value: 'CHANGED'},
{type: 'node', children: [{type: 'leaf', value: 'CHANGED'}]},
{type: 'void'},
{type: 'leaf', value: 'CHANGED'}
]
}
👉 Note:
next
is a changed clone andtree
is not mutated.
This package exports the identifier map
.
There is no default export.
map(tree, mapFunction)
Create a new tree by mapping all nodes with the given function.
tree
(Node
)
— tree to mapmapFunction
(MapFunction
)
— function called with a node, its index, and its parent to produce a new
nodeNew mapped tree (Node
).
MapFunction
Function called with a node, its index, and its parent to produce a new node (TypeScript type).
node
(Node
)
— node to mapindex
(number
or undefined
)
— index of node
in parent
(if any)parent
(Node
or undefined
)
— parent of node
New mapped node (Node
).
The children on the returned node are not used. If the original node has children, those are mapped instead.
This package is fully typed with TypeScript.
It exports the additional type MapFunction
.
Projects maintained by the unified collective are compatible with maintained versions of Node.js.
When we cut a new major release, we drop support for unmaintained versions of
Node.
This means we try to keep the current release line, unist-util-map@^4
,
compatible with Node.js 16.
unist-util-filter
— create a new tree with all nodes that pass the given functionunist-util-flatmap
— create a new tree by expanding a node into manyunist-util-remove
— remove nodes from treesunist-util-select
— select nodes with CSS-like selectorsunist-util-visit
— walk treesunist-builder
— create treesSee contributing.md
in syntax-tree/.github
for
ways to get started.
See support.md
for ways to get help.
This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.
FAQs
unist utility to create a new tree by mapping all nodes
The npm package unist-util-map receives a total of 66,133 weekly downloads. As such, unist-util-map popularity was classified as popular.
We found that unist-util-map demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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