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How to use the slice function from ramda

Find comprehensive JavaScript ramda.slice code examples handpicked from public code repositorys.

ramda.slice returns a portion of a list or string, specified by a start index and an end index.

helper.js

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// assign for each locale
for (const locale of selectedLocales) {
  if (R.keys(localIModelByLocale).includes(locale)) {
    continue;
  }
  const languageExtractor = (s) => R.slice(0, R.lastIndexOf("-", s), s);
  const language = languageExtractor(locale);
  const reusableLocale = R.find((k) => languageExtractor(k) === language)(R.keys(localIModelByLocale));
  if (reusableLocale) {
    result.set(locale, {uri: localIModelByLocale[reusableLocale], canCopy: true});

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+ 4 other calls in file

bit-utils.js

GitHub: bitmark-standard/bitmark-grammar

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tmps = R.slice(start+nloff, stop+nloff+2, this.source);
let i = 0;
while (tmps[i++].match(/[ \t\n\r]/)) 
  nloff++;
if (nloff0 != nloff)
  tmps = R.slice(start+nloff, stop+nloff+2, this.source);
     }
     return tmps;
   }
   return '';

+ 23 other calls in file

How does ramda.slice work?

ramda.slice is a function that takes three arguments: a start index, an end index, and a list or string to slice. It returns a new list or string that contains the elements between the start and end indices, inclusive of the start index but exclusive of the end index.

The ramda.slice function is curried, meaning it can be partially applied. If you pass only the start index to ramda.slice, you'll get a new function that expects the end index and the list or string to slice. If you pass only the start and end indices, you'll get a new function that expects the list or string to slice.

The start and end indices can be negative, indicating that they should be counted from the end of the list or string. If the end index is omitted or greater than the length of the list or string, ramda.slice will return all the elements from the start index to the end of the list or string. If the start index is greater than or equal to the length of the list or string, an empty list or string will be returned.

utils.js

GitHub: alvaro-cuesta/aoc-js

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const util = require('util')
const vec = require('./vec')


const parseLines = R.pipe(R.split('\n'), R.slice(0, -1))


const parseText = R.slice(0, -1)


const parseDecimal = (x) => parseInt(x, 10)


const inspect = (x) =>

+ 4 other calls in file

07.js

GitHub: alvaro-cuesta/aoc-js

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  return R.modify(
    'cwd',
    dir === '/'
      ? R.always([])
      : dir === '..'
      ? R.slice(0, -1)
      : R.append(dir),
    state,
  )
} else if (command === 'ls') {

Ai Example

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const R = require("ramda");

const str = "Hello, world!";
const result = R.slice(0, 5, str); // Returns 'Hello'

console.log(result);

In this example, ramda.slice is used to extract the first 5 characters of the string 'Hello, world!'. The start index is 0, and the end index is 5, so ramda.slice returns the substring 'Hello'. Note that ramda.slice returns a new string; it does not modify the original string.

bundle.js

GitHub: brrf/practice-projects

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* @example
*
*      R.slice(1, 3, ['a', 'b', 'c', 'd']);        //=> ['b', 'c']
*      R.slice(1, Infinity, ['a', 'b', 'c', 'd']); //=> ['b', 'c', 'd']
*      R.slice(0, -1, ['a', 'b', 'c', 'd']);       //=> ['a', 'b', 'c']
*      R.slice(-3, -1, ['a', 'b', 'c', 'd']);      //=> ['b', 'c']
*      R.slice(0, 3, 'ramda');                     //=> 'ram'
*/

+ 9 other calls in file

inotify.js

GitHub: WebFuturistics/secure_post_builder

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function isUserMaskChainMatch(inotifyMaskChains, userMaskChain) {
    return any((inotifyMaskChain) => {
        const inotifyMaskChainLength = length(inotifyMaskChain);
        const userMaskChainLength = length(userMaskChain);

        const truncatedUserMaskChain = slice(userMaskChainLength - inotifyMaskChainLength, Infinity, userMaskChain);
        return equals(truncatedUserMaskChain, inotifyMaskChain)
    })(inotifyMaskChains);
}

day02.js

GitHub: jcla1/AdventOfCode

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const input = fs.readFileSync('inputs/day02.input', 'utf8').trim();


const pwPolicies = R.compose(
    R.map(R.o(
        R.slice(1, 5),
        R.match(/(\d+)-(\d+) ([a-z]): ([a-z]+)/))),
    R.split('\n'))(input);


const isValidPart1 = ([low, high, lett, pw]) => {

+ 2 other calls in file

index.js

GitHub: VesaLahd/aoc2022

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  R.map(R.nth(R.__, cave)),
  R.map(coordinatesToIndex),
  R.apply(R.xprod),
  R.append(R.__, [[c]])
)(R.range(0, normalizedMax[1] + 1))
const row = (cave, r) => R.slice(r * (normalizedMax[0] + 1), (r+1) * (normalizedMax[0] + 1), cave)


const cave = Array(R.apply(R.multiply)(R.map(R.inc, normalizeCoordinates(maxDimensions)))).fill('.')


const lineComponents = R.compose(

+ 2 other calls in file

day05.js

GitHub: jcla1/AdventOfCode

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const isGridLine = (l) => l[0] === l[2] || l[1] === l[3];
const addBoards = R.mergeDeepWith(R.add);


const drawLine = (line) => {
  const start = R.slice(0, 2, line);
  const end = R.slice(2, 4, line);


  const direction = R.compose(
      R.map(U.sign),
      R.zipWith(R.subtract))(end, start);

+ 5 other calls in file

cyclejs-audio-driver.js

GitHub: jemmyw/cyclejs-audio-driver

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* @param {*} list
* @return {*}
* @example
*
*      R.slice(1, 3, ['a', 'b', 'c', 'd']);        //=> ['b', 'c']
*      R.slice(1, Infinity, ['a', 'b', 'c', 'd']); //=> ['b', 'c', 'd']
*      R.slice(0, -1, ['a', 'b', 'c', 'd']);       //=> ['a', 'b', 'c']
*      R.slice(-3, -1, ['a', 'b', 'c', 'd']);      //=> ['b', 'c']
*      R.slice(0, 3, 'ramda');                     //=> 'ram'
*/

+ 89 other calls in file

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