How to use the addIndex function from ramda
Find comprehensive JavaScript ramda.addIndex code examples handpicked from public code repositorys.
ramda.addIndex is a function in the Ramda library for JavaScript that applies a function to an array, passing in the index of each element as an additional argument.
113 114 115 116 117 118 119 120 121 122 123 124 125 126
const valueForKey = (v) => v[key(v)] const returnArray = (prop) => R.pathOr([], [prop]) const mapIndexed = R.addIndex(R.map) const set = (arr, prop) => match(prop) .on(exists, (prop) => {
27 28 29 30 31 32 33 34 35 36
const scopes = R.pipe( R.reduce(allPathCombinations, []), R.sort((a, b) => a.localeCompare(b)), R.uniq, R.addIndex(R.map)((name, index) => { return { value: name, name: `${index + 1}) ${name}`, }
How does ramda.addIndex work?
The ramda.addIndex function in the Ramda library for JavaScript is used to apply a function to an array, passing in the index of each element as an additional argument. When called, ramda.addIndex takes two arguments: a function fn to be applied to the array, and the array list to be processed. The ramda.addIndex function then applies the function fn to each element of the array list, passing in the index of each element as an additional argument. The function fn is called with three arguments: the value of the element, the index of the element, and the entire array being processed. For example, you could use ramda.addIndex to add the index of each element to an array like this: javascript Copy code {{{{{{{ import { addIndex, map } from 'ramda'; const list = ['a', 'b', 'c']; const result = addIndex(map)((value, index) => `${value}-${index}`, list); console.log(result); // logs ['a-0', 'b-1', 'c-2'] In this example, we first import the addIndex and map functions from the Ramda library using the ES6 import statement. We then define an array list with three string elements. We call addIndex(map) with a function that takes two arguments: the value of the element and the index of the element. This function returns a string that combines the value of the element and its index. Finally, we pass the function and the list array to addIndex(map) to apply the function to each element of the array, passing in the index of each element as an additional argument. We store the result as result and log it to the console using console.log. In summary, ramda.addIndex is a function in the Ramda library for JavaScript that applies a function to an array, passing in the index of each element as an additional argument. The function fn is called with three arguments: the value of the element, the index of the element, and the entire array being processed.
GitHub: zerobias/speak-r
![zerobias profile picture](/zerobias.png?size=40)
13 14 15 16 17 18 19 20 21 22
const Lexeme = require('../model/lexeme') const Err = require('../model/error') const chain = func => o => o.chain(func) const indexation = addIndex(map)(useWith(pair, [prop('value'), identity])) class IndexMap { constructor(context = []) { const arr = indexation(context)
+ 13 other calls in file
50 51 52 53 54 55 56 57 58 59
R.identity ) ) ); const mapIndexed = R.addIndex(R.map); const coerceApiDescriptions = R.compose( mapIndexed((content, index) => ({ location: `configuration.apiDescriptions[${index}]`,
Ai Example
1 2 3 4 5 6
import { addIndex, map } from "ramda"; const list = ["a", "b", "c"]; const result = addIndex(map)((value, index) => `${value}-${index}`, list); console.log(result); // logs ['a-0', 'b-1', 'c-2']
In this example, we first import the addIndex and map functions from the Ramda library using the ES6 import statement. We then define an array list with three string elements. We call addIndex(map) with a function that takes two arguments: the value of the element and the index of the element. This function returns a string that combines the value of the element and its index. Finally, we pass the function and the list array to addIndex(map) to apply the function to each element of the array, passing in the index of each element as an additional argument. We store the result as result and log it to the console using console.log. When you run this example in a JavaScript environment like a web browser or Node.js, you should see the array ['a-0', 'b-1', 'c-2'] logged to the console, indicating that the index of each element has been successfully added to the array using ramda.addIndex.
GitHub: curran/gadm-geojson
![curran profile picture](/curran.png?size=40)
61 62 63 64 65 66
exports.cleanDirectories = R.curry(cleanDirectories); exports.cleanNodeInput = cleanNodeInput; exports.isStringType = isStringType; exports.fileTypeInDir = R.curry(fileTypeInDir); exports.lengthZero = lengthZero; exports.mapIndexed = R.addIndex(R.map);
GitHub: alvaro-cuesta/aoc-js
137 138 139 140 141 142 143 144 145 146 147 148 149
} return match.groups }) const enumerate = R.addIndex(R.map)((x, i) => [i + 1, x]) function* iterateStraightLines([x0, y0], [x1, y1]) { if (x0 === x1) { if (y0 < y1) {
+ 4 other calls in file
5 6 7 8 9 10 11 12 13 14 15 16 17
console.log('\n=== addIndex ==='); const double = R.multiply(2); console.log(R.map(double, [5, 10, 15, 20, 25])); const doublePlusIndex = (v, i) => double(v) + i; const indexedMap = R.addIndex(R.map); console.log(indexedMap(doublePlusIndex, [5, 10, 15, 20, 25])); /**
+ 2 other calls in file
2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
* @category List * @sig (a -> *) -> [a] -> [a] * @param {Function} fn The function to invoke. Receives one argument, `value`. * @param {Array} list The list to iterate over. * @return {Array} The original list. * @see R.addIndex * @example * * var printXPlusFive = x => console.log(x + 5); * R.forEach(printXPlusFive, [1, 2, 3]); //=> [1, 2, 3]
+ 89 other calls in file
GitHub: mathiopia/practice
23 24 25 26 27 28 29 30 31 32
// x =>x.toUpperCase(), // person // ) // ) // console.log( // R.addIndex(R.map)( // (val,ind) => val +": "+ind, // [1,2,3,4,5] // ) // )
+ 2 other calls in file
GitHub: VesaLahd/aoc2022
52 53 54 55 56 57 58 59 60 61 62 63
}) const part1 = R.compose( R.length, R.filter(R.identity), R.addIndex(R.map)(isVisible), )(flatForest) const part2 = R.compose( R.apply(Math.max),
+ 5 other calls in file
GitHub: dqmmpb/define-demos
326 327 328 329 330 331 332 333 334 335 336 337 338
log(R.lastIndexOf(10)([1, 2, 3, 4])); var double = x => x * 2; log(R.map(double)(numbers)); var mapIndexed = R.addIndex(R.map); var logMap = (val, idx) => { log(idx, val); }
+ 9 other calls in file
0 1 2 3 4 5 6 7 8 9 10
const R = require('ramda'); const permutations = (tokens, subperms = [[]]) => R.isEmpty(tokens) ? subperms : R.addIndex(R.chain)((token, idx) => permutations( R.remove(idx, 1, tokens), R.map(R.append(token), subperms) ), tokens);
264 265 266 267 268 269 270 271 272
* @sig ((a ... -> b) ... -> [a] -> *) -> ((a ..., Int, [a] -> b) ... -> [a] -> *) * @param {Function} fn A list iteration function that does not pass index or list to its callback * @return {Function} An altered list iteration function that passes (item, index, list) to its callback * @example * * const mapIndexed = R.addIndex(R.map); * mapIndexed((val, idx) => idx + '-' + val, ['f', 'o', 'o', 'b', 'a', 'r']); * //=> ['0-f', '1-o', '2-o', '3-b', '4-a', '5-r'] */
+ 7 other calls in file
0 1 2 3 4 5 6 7 8 9 10 11
const { readFile } = require('fs'); const { promisify } = require('util'); const { splitWhenever, equals, map, sum, addIndex, sortWith, descend, prop, head } = require('ramda'); const read = promisify(readFile); const mapWithIndex = addIndex(map); const sortByCaloriesDesc = sortWith([descend(prop('calories'))]); read('./input') .then(String)
GitHub: VesaLahd/aoc2022
17 18 19 20 21 22 23 24 25 26 27 28
)(content) const part1 = R.compose( R.sum, R.converge(Array.of, indices), R.addIndex(R.map)((value, index) => R.multiply(value, R.inc(index))), )(registerValues) const screen = R.addIndex(R.map)((_, i) => R.inc(i), Array(40*6))
+ 3 other calls in file
22 23 24 25 26 27 28 29 30 31
console.error(e) } } exports.generateHoldingsReport = function(investmentData, companyData) { const chainIndexed = R.addIndex(R.chain); const mapIndexed = R.addIndex(R.map); return chainIndexed((investment, investmentIndex) => mapIndexed((holding, holdingIndex) => ({
+ 3 other calls in file
ramda.clone is the most popular function in ramda (30311 examples)