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How to use the path function from ramda

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

ramda.path is a function that retrieves the value of a nested object property, based on a given path of keys.

helper.js

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const lambdaClient = new LambdaClient({awsProfile, awsRegion});
// check if user sets userConfig with "sourceLambda" field to reuse existing Lambda
const sourceLambdaArn =
  alexaRegion === "default"
    ? R.path(["sourceLambda", "arn"], userConfig)
    : R.path(["regionalOverrides", alexaRegion, "sourceLambda", "arn"], userConfig);
if (stringUtils.isNonBlankString(sourceLambdaArn)) {
  return _loadLambdaFromUserConfigSource(reporter, lambdaClient, sourceLambdaArn, (loadErr, sourceLambdaData) => {
    callback(loadErr, loadErr ? undefined : sourceLambdaData);
  });

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+ 19 other calls in file

index.js

GitHub: alexa/ask-cli

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 */
_getAlexaDeployRegions(regionsList, userConfig) {
  const deployRegions = {};
  regionsList.forEach((alexaRegion) => {
    const awsRegion =
      alexaRegion === "default" ? userConfig.awsRegion : R.path(["regionalOverrides", alexaRegion, "awsRegion"], userConfig);
    deployRegions[alexaRegion] = awsRegion || defaultAlexaAwsRegionMap[alexaRegion];
  });
  return deployRegions;
}

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How does ramda.path work?

ramda.path is a function in the Ramda library that takes a list of property names and an object, and returns the value of the nested property with the given path within the object.

For example, if we have an object person with properties name and address, and address has a nested property city, we can get the city value using ramda.path(['address', 'city'], person).

deepDotEquals.js

GitHub: dmcquay/katas

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}


function deepDotEquals(obj1, obj2) {
  const paths = _enumeratePaths(obj1);
  const pathsWithEquals = paths.filter(
    (p) => typeof R.path(p, obj1).equals === "function"
  );
  let obj1Clone = R.clone(obj1);
  let obj2Clone = R.clone(obj2);
  for (const p of pathsWithEquals) {

utils.js

GitHub: pagarme/escriba

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  return !R.contains(false, validationResult)
}


const isIronMaskVendor = vendor => {
  if (!R.is(Object, vendor)) return false
  if (!R.is(Function, R.path(['create'], vendor))) return false
  if (!R.is(Function, vendor.create({}))) return false
  return true
}

+ 567 other calls in file

Ai Example

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const R = require("ramda");

const user = {
  id: 123,
  name: "John Doe",
  address: {
    city: "New York",
    country: "USA",
  },
};

const cityName = R.path(["address", "city"], user); // 'New York'
const stateName = R.path(["address", "state"], user); // undefined

In the above example, ramda.path is used to retrieve the value of the city property from the address object in the user object. It takes an array of property names or indexes as its first argument and an object as its second argument. It returns the value at the specified property path or undefined if the path doesn't exist.

protobuf.js

GitHub: nav-inc/nav-schema-architecture

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  (p) => p.value,
  noNullElementArray(R.map((p) => (p?.type?.isArray === true ? p.name : undefined), rootStructTypes))
)

const protoTypesGen = R.map(({ addOn, isEnum, isScalar, type }) => {
  if (isScalar || R.path('scalar', type)) {
    generatedScalars.push(type)
  }
  if (!isEnum) {
    return addOn

index.js

GitHub: foray1010/chrome-manifest-loader

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const idMappings = reduceMatchedKeyPaths(manifest).map(
  ({ matchedKeyPath }) => {
    return {
      id: nanoid(),
      filePath: R.path(matchedKeyPath, manifest).replace(
        requireRegexp,
        (match, p1) => p1,
      ),
      keyPath: matchedKeyPath,

selectors.js

GitHub: otpusk/apisearch-toolbox

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exports.getHotelsMarkers = getHotelsMarkers;


var getCenterByHotelsMarkers = function getCenterByHotelsMarkers() {
  return (0, _reselect.createSelector)(getHotelsMarkers(), function (markers) {
    return !R.isEmpty(markers) ? R.call(R.pipe(R.map(R.applySpec({
      latitude: R.path(['position', 'lat']),
      longitude: R.path(['position', 'lng'])
    })), _geolib.getCenter, R.applySpec({
      lat: R.prop('latitude'),
      lng: R.prop('longitude')

+ 83 other calls in file

AuthMiddleware.js

GitHub: com2u/SVTrain

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const isTheRightKid = (kid) => (publicKey) => publicKey.kid === kid


const findPublicKeyFromKid = (publicKey) => (kid) =>
  find(isTheRightKid(kid))(publicKey)


const getKid = path(['header', 'kid'])


const decode = compose(curryN(2), flip)(jwt.decode)


const getUserFromPublicKey = (token) => compose(makeUser, verify(token))

index.js

GitHub: Ferlab-Ste-Justine/node-jwt

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const get_token_from_header = R.compose(
    either_utils.if_nil_else(
        generate_token_undefined_err,
        extract_auth_header
    ),
    R.path(['headers', 'authorization'])
)


/*
  Extract the encrypted jwt token from the cookies.

+ 419 other calls in file

upload.js

GitHub: Leechael/phat-contract-cli-upload

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  return process.exit(1)
}

const instantiateEvent = R.find(R.pathEq(['event', 'method'], 'Instantiating'), instantiateResult.events)
console.log('instantiateEvent: ', instantiateEvent)
const contractId = R.path(['event', 'data', 'contract'], instantiateEvent)
console.log('Instantiated contract ID: ', contractId)

try {
  await checkUntilEq(

+ 339 other calls in file

appList.js

GitHub: nevzra/google-play-scraper

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/*
 * Apply MAPPINGS for each application in list from root path
*/


function extract (root, data) {
  const input = R.path(root, data);
  if (input === undefined) return [];
  return R.map(scriptData.extractor(MAPPINGS), input);
}

cmr.js

GitHub: NASA-IMPACT/nncpp-cumulus-deploy

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}


async function pagedSearch({ client, url, options = {}, _hits = 0, _count = 0 }) {
  const scrollIdPath = ['headers', 'cmr-scroll-id'];
  const pageNumPath = ['params', 'pageNum'];
  const getScrollId = R.path(scrollIdPath);
  const getPageNum = R.pathOr(1, pageNumPath);
  const getPageSize = R.pathOr(10, ['params', 'pageSize']);
  const nextOptions = (id) => id
    ? R.assocPath(scrollIdPath, id, options)

context.js

GitHub: moyataka/amberik-core

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		retain: R.always(max_retain),
	}
})
const purge = R.dissoc(cur_name)

const getKeepCtxName = R.path(['_keep', 'ctx', 'name'])

return (prev, nex) => {
	const has_keep = hasContextName('_keep')(nex)
	if (has_keep) {

index.js

GitHub: muqsitnawaz/deepcoin

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let isInputTransactionsUnspent = R.all(R.equals(false), R.flatten(R.map((txInput) => {
    return R.map(
        R.pipe(
            R.prop('transactions'),
            R.map(R.pipe(
                R.path(['data', 'inputs']),
                R.contains({ transaction: txInput.transaction, index: txInput.index })
            ))
        ), referenceBlockchain);
}, transaction.data.inputs)));

parametricLadder.js

GitHub: eluv-io/elv-abr-profile

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  rungSpecsRemove(landscapeVideoProps.height)
),
addRungSpecHeightsAndWidths(aspectRatio),
when(
  R.pipe(
    R.path(['limits', 'finalBitrateMax']),
    R.isNil,
    R.not
  ),
  rungSpecsCapMaxBitrate

+ 252 other calls in file

cyclejs-audio-driver.js

GitHub: jemmyw/cyclejs-audio-driver

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* @category Object
* @sig s -> {s: a} -> a | Undefined
* @param {String} p The property name
* @param {Object} obj The object to query
* @return {*} The value at `obj.p`.
* @see R.path
* @example
*
*      R.prop('x', {x: 100}); //=> 100
*      R.prop('x', {}); //=> undefined

+ 53 other calls in file

bundle.js

GitHub: areca/misc

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 * @param {Object} obj The object to retrieve the nested property from.
 * @return {*} The data at `path`.
 * @see R.prop
 * @example
 *
 *      R.path(['a', 'b'], {a: {b: 2}}); //=> 2
 *      R.path(['a', 'b'], {c: {b: 2}}); //=> undefined
 */
var path = _curry2(function path(paths, obj) {
    var val = obj;

+ 56 other calls in file

errors.js

GitHub: avanzu/node-packages

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const makeError = (reason) => new Error(`${reason}`)
const toError = when(complement(is(Error)), makeError)
const descriptionOrMessage = either(
    pick(['message', 'errors', 'data']),
    path(['props', 'description'])
)
const conditionOf = pathOr('', ['props', 'condition'])
const statusOf = propOr(500, 'code')

getAllCloudUsersSpec.js

GitHub: AlienCreations/auth-platform

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      converter    = new CSVConverter({});


const getAllCloudUsers = require('../../../../server/core/controllers/api/cloudUser/getAllCloudUsers');


const COMMON_PRIVATE_FIELDS = R.path(['api', 'COMMON_PRIVATE_FIELDS'], config),
      USER_PRIVATE_FIELDS   = R.path(['api', 'USER_PRIVATE_FIELDS'],   config),
      CALENDAR_DATE_FORMAT  = 'YYYY-MM-DD';


const privateFields = R.concat(COMMON_PRIVATE_FIELDS, USER_PRIVATE_FIELDS);

+ 5 other calls in file

bundle.js

GitHub: Gaoey/canvas-vertice-google-detected-text

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* @see R.prop, R.nth
* @example
*
*      R.path(['a', 'b'], {a: {b: 2}}); //=> 2
*      R.path(['a', 'b'], {c: {b: 2}}); //=> undefined
*      R.path(['a', 'b', 0], {a: {b: [1, 2, 3]}}); //=> 1
*      R.path(['a', 'b', -2], {a: {b: [1, 2, 3]}}); //=> 2
*/

+ 19 other calls in file

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