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How to use the last function from ramda

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

ramda.last returns the last element of an array.

util.js

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    obj
  )

const clone = (obj) => JSON.parse(JSON.stringify(obj))

const key = (r) => R.last(R.keys(r))

const valueForKey = (v) => v[key(v)]

const returnArray = (prop) => R.pathOr([], [prop])

controller.js

GitHub: trick77/bc-src

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this._initialSyncPeers = this._initialSyncPeers.filter(syncPeer => syncPeer.host !== peer.host);
if (peerSegments[peer.host]) {
  delete peerSegments[peer.host];
}
const [firstHash] = this._requestedBlockHashes;
const lastHash = last(this._requestedBlockHashes);
if (!lastHash) {
  this._logger.debug('Request headers array was empty and should not be');
}
// const peerMessage = new Messages().GetBlocks({ starts: [firstHash], stop: lastHash })

+ 2 other calls in file

How does ramda.last work?

ramda.last is a function that takes an array as its argument and returns the last element of the array. It does not modify the original array. If the input array is empty, it returns undefined.

index.js

GitHub: pounce-lang/js-core

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'pop': {
    dt: '[[[A+]][[Ab] Al] bind]',
    compose: function (s) {
        var arr = toArrOrNull(s === null || s === void 0 ? void 0 : s.pop());
        if (arr) {
            s.push(r.init(arr), r.last(arr));
        }
        return [s];
    }
},

+ 4 other calls in file

dataSetup.js

GitHub: mvp-rockets/backend-core

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    return data;
};


const deleteEntity = R.curry(async (changeDependency, entityToDelete) => {
    const data = R.compose(getEntity, R.head)(entityToDelete);
    const entity = R.last(entityToDelete);
    return deleteAssociatedEntities(entity, data, changeDependency);
});

Ai Example

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const myArray = [1, 2, 3];
const lastElement = R.last(myArray); // Returns 3

test.lib.util.js

GitHub: nav-inc/nav-schema-architecture

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  strictEqual(R.isEmpty(enumValues({})), true)
})

it('should return the list of values of the enum type', function () {
  const m = extractValue(
    R.last(
      enumValues({
        kind: 'EnumTypeDefinition',
        name: {
          kind: 'Name',

protobuf.js

GitHub: nav-inc/nav-schema-architecture

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)

const generatedEnums = []
const generatedScalars = []
const entity = `${camelToSnakeCase(R.last(namespace.split('.')))}${version > 1 ? `_v${version}` : ''}`
const rootStruct = R.last(protoTypes).sort((a, b) => {
  const aDirectives = __directives(a)
  const bDirectives = __directives(b)
  if (parseInt(order(aDirectives[extractName(a)])) > parseInt(order(bDirectives[extractName(b)]))) {
    return 1

index.js

GitHub: muqsitnawaz/deepcoin

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getBlockByHash(hash) {
    return R.find(R.propEq('hash', hash), this.blocks);
}

getLastBlock() {
    return R.last(this.blocks);
}

getDifficulty(index) {        
    // Calculates the difficulty based on the index since the difficulty value increases every X blocks.

cyclejs-audio-driver.js

GitHub: jemmyw/cyclejs-audio-driver

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* @param {*} list
* @return {*}
* @see R.init, R.head, R.tail
* @example
*
*      R.last(['fi', 'fo', 'fum']); //=> 'fum'
*      R.last([]); //=> undefined
*
*      R.last('abc'); //=> 'c'
*      R.last(''); //=> ''

+ 71 other calls in file

helpers.js

GitHub: MatchBox-ID/matchstore.is-a.dev

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const batchLazyTasks = count => tasks => tasks.reduce((batches, task) => {
  if (batches.length === 0) return [[task]];


  const full = R.init(batches);
  const last = R.last(batches);


  if (last.length >= count) return [...batches, [task]];
  return [...full, [...last, task]];
}, []);

+ 3 other calls in file

build

GitHub: desenmeng/ramda

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var getModifiedSource = function getModifiedSource(identifier) {
  var obj = parse(identifierToFilename(identifier));
  escodegen.attachComments(obj.ast, obj.comments, obj.tokens);
  abortIfEmptyBody(obj.ast);
  abortIfExportNotLast(obj.ast);
  var last = R.last(obj.ast.body);
  var declarationAst = {
    type: 'VariableDeclaration',
    kind: 'var',
    leadingComments: obj.comments,

puzzle.js

GitHub: holden-caulfield/adventofcode2020

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const data = require("./data.json")
const R = require("ramda")


const sortedAdapters = R.pipe(
  R.sort((a, b) => a - b),
  (arr) => [0, ...arr, R.last(arr) + 3]
)(data)


const countJoltageDiffs = R.pipe(
  R.aperture(2),

Game.js

GitHub: sujana102119/snakes-and-ladders

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  }

  // ------------PUBLIC INSTANCE METHODS -------------------

  getRollsToWin() {
      const winner = this.#players.find(player => R.last(player.getMoves()).endPosition === this.#boardSize);
const rollsToWinInGame = winner.getRolls().length;
console.log(`Winner ${winner.userId} needed ${rollsToWinInGame} rolls to win`)
return rollsToWinInGame;
  }

wallet.js

GitHub: O-H-S/blockchain

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    if (this.secret == null)
{
        this.generateSecret();
    }

    let lastKeyPair = R.last(this.keyPairs);

    // Generate next seed based on the first secret or a new secret from the last key pair.
    let seed = (lastKeyPair == null ?  this.secret : CryptoUtil.generateSecret(R.propOr(null, 'secretKey', lastKeyPair)));
    let keyPairRaw = CryptoUtil.generateKeyPairFromSecret(seed);

main02.js

GitHub: martinezq/adventOfCode2022

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// --------------------------------------------


function parse(lines) {
    const moves = [];


    const moves1 = R.last(lines).split('');
    let buf = [];


    for (let i = 0; i < moves1.length; i ++) {
        if (Number.isInteger(Number.parseInt(moves1[i]))) {

RewardPopupsMgr.js

GitHub: phucnds/VTP

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            UserProfile_1.userProfile.UpdateBalance();
        }, 1000);
    });
};
RewardPopupsMgr.prototype.showPopup = function () {
    var item = R.last(this.rewardPopups);
    if (!item)
        return;
    this.rewardPopups = R.dropLast(1, this.rewardPopups);
    var _a = item.data, turn = _a.turn, coin = _a.coin, type = item.type;

coin-selection.js

GitHub: topcoder1208/My-Wallet-V4

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if (isEmpty(selection)) {
  // no coins to select
  return { fee: 0, inputs: [], outputs: [] };
} else {
  let maxBalance = last(selection)[0];
  let fee = last(selection)[1];
  let selectedCoins = map(e => e[2], selection);
  if (maxBalance < target + fee) {
    // not enough money to satisfy target
    return { fee: fee, inputs: [], outputs: targets };

+ 3 other calls in file

ReviewAuditModal.jsx

GitHub: dvaditya/Autologyx

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const dispatch = useDispatch()
const classes = useStyles();
const url = getOrigin()
const api_key = getApiKey()
const handleDownloadReportLink = () => {
  const docId = audit.field_audit_document ? R.last(audit.field_audit_document.split("/")).split(".")[0] : null
  if (!docId) {
    return null
  }
  return `${url}/system/file-store/download/${docId}/`

rungSpec.js

GitHub: eluv-io/elv-abr-profile

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// allow differentiation between first iteration and subsequent iterations
// const bitrateAdder = (resultAccumulator, rungSpec) => kindof(resultAccumulator) === 'number' ?
//   [R.assoc('bitrate', resultAccumulator, rungSpec)] :
//   [...resultAccumulator, R.assoc(
//     'bitrate',
//     nextRungBitrate(R.last(resultAccumulator).bitrate, R.last(resultAccumulator).dim, rungSpec.dim, rungSpec.tuning),
//     rungSpec
//   )]


// bitrateDimMult :: RungSpec -> Number -> Number

+ 3 other calls in file

11.1.js

GitHub: cberube/AoC-2022

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    right: R.compose(maybeAsInt, R.prop(2)),
    op: R.prop(1)
  }),
  R.split(' '),
  R.trim(),
  R.last(),
  R.split('=')
)(operationData),
testValue: extractNumber(testData),
trueTarget: extractNumber(trueData),

index.js

GitHub: oldben87/advent-of-code

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console.time("pt2")
console.log(
  "pt2",
  findWireAValue(
    commands.filter((cmd) => R.last(cmd) !== "b"),
    { b: 956 }
  )
)
console.timeEnd("pt2")

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