find-replace
v5.0.2
Published
Replace or remove multiple items in an array.
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find-replace
Replace or remove multiple items in an array.
Similar to array.prototype.splice() with the following differences:
splice
only operates on one item at a time requiring you to know its index.find-replace
will operate on every item satisfying the find function.- If a function is passed as a
replaceWith
argument,find-replace
will invoke it to compute the replacement value.
Synopsis
import findReplace from 'find-replace'
const colours = ['red', 'white', 'blue', 'white']
const result = findReplace(
colours,
colour => colour === 'white',
'gold'
)
console.log(result)
// [ 'red', 'gold', 'blue', 'gold' ]
If the replaceWith
value is a function, it will be invoked with the found item and its result used as the replace value. For example:
const colours = ['red', 'white', 'blue', 'white']
const result = findReplace(
colours,
colour => colour === 'red',
colour => colour.split('')
)
console.log(result)
// [ 'r', 'e', 'd', 'white', 'blue', 'white' ]
Real world examples
Replace with an array of strings
This example explodes combined (-vrf
) into individual flags (-v -r -f
).
import findReplace from 'find-replace'
const argv = ['-vrf', 'file1.js', 'file2.js']
const combinedShortOptionRe = /^-[^\d-]{2,}$/
const result = findReplace(
argv,
arg => combinedShortOptionRe.test(arg),
arg => {
return arg
.slice(1) /* remove initial hypen */
.split('')
.map(letter => '-' + letter)
}
)
console.log(result)
Output:
$ node example/argv.mjs
[ '-v', '-r', '-f', 'file1.js', 'file2.js' ]
Delete found items
If you omit the third replaceWith
argument, all found items will be deleted.
import findReplace from 'find-replace'
const fruits = ['apple', 'pear', 'nectarine', 'pineapple', 'peach']
const bad = ['pear', 'pineapple']
const result = findReplace(
fruits,
fruit => bad.includes(fruit)
)
console.log(result)
Output:
$ node example/delete.mjs
[ 'apple', 'nectarine', 'peach' ]
API Reference
find-replace
findReplace(array, findFn, [...replaceWith]) ⇒ array ⏏
Kind: Exported function
| Param | Type | Description |
| --- | --- | --- |
| array | array | The input array |
| findFn | function | A predicate function which, if returns true
causes the current item to be operated on. |
| [...replaceWith] | any | If not specified, each found value will be removed. If specified, each found value will be replaced with this value. If the replaceWith
value is a function, it will be invoked with the found value and its result used as the replace value. If the replaceWith
function returns an array, the found value will be replaced with each item in the array (not replaced with the array itself). |
Load anywhere
This library is compatible with Node.js, the Web and any style of module loader. It can be loaded anywhere, natively without transpilation.
Node.js (CommonJS):
const findReplace = require('find-replace')
Node.js (ECMAScript Module):
import findReplace from 'find-replace'
Modern browser (ECMAScript Module):
import findReplace from './node_modules/find-replace/dist/index.mjs'
Old browser (adds window.findReplace
):
<script nomodule src="./node_modules/find-replace/dist/index.js"></script>
© 2015-25 Lloyd Brookes <[email protected]>.
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