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How to use the isString function from lodash

Find comprehensive JavaScript lodash.isString code examples handpicked from public code repositorys.

lodash.isString is a function in the Lodash library that checks if a value is a string.

ObjectUtils.js

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export function isNonEmptyObject(obj) {
  return _.isObject(obj) && Object.keys(obj).length > 0;
}

export function isNonEmptyString(str) {
  return _.isString(str) && str.trim().length > 0;
}

export function isEmptyString(str) {
  return !(_.isString(str) && str.trim().length > 0);

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+ 3 other calls in file

combobox.jsx

GitHub: naturalcrit/homebrewery

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},
renderDropdown : function(dropdownChildren){
	if(!this.state.showDropdown) return null;
	if(this.props.autoSuggest && !this.state.inputFocused){
		const suggestMethod = this.props.autoSuggest.suggestMethod;
		const filterOn = _.isString(this.props.autoSuggest.filterOn) ? [this.props.autoSuggest.filterOn] : this.props.autoSuggest.filterOn;
		const filteredArrays = filterOn.map((attr)=>{
			const children = dropdownChildren.filter((item)=>{
				if(suggestMethod === 'includes'){
					return item.props[attr]?.toLowerCase().includes(this.state.value.toLowerCase());

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How does lodash.isString work?

Sure! lodash.isString is a function in the Lodash library that checks if a value is a string. The purpose of lodash.isString is to determine whether a given value is a string or not. If the value is a string, lodash.isString returns true. If the value is not a string, lodash.isString returns false. To use lodash.isString, you call it with a single argument: the value you want to check. lodash.isString then returns a boolean value (true or false) depending on whether the value is a string. For example, consider the following code: javascript Copy code {{{{{{{ import { isString } from 'lodash'; console.log(isString('hello')); // true console.log(isString(42)); // false console.log(isString(null)); // false In this example, we first import the isString function from the lodash library. We then call isString with three different arguments: the string 'hello', the number 42, and the value null. In the first call to isString, the argument is a string, so isString returns true. In the second call to isString, the argument is a number, which is not a string. isString therefore returns false. In the third call to isString, the argument is null, which is not a string. isString therefore returns false. This code demonstrates how lodash.isString can be used to check if a given value is a string.

astrobench.js

GitHub: Irrelon/ForerunnerDB

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* var otherWords = ['hi', 'goodbye'];
*
* _.isEqual(words, otherWords, function(a, b) {
*   var reGreet = /^(?:hello|hi)$/i,
*       aGreet = _.isString(a) && reGreet.test(a),
*       bGreet = _.isString(b) && reGreet.test(b);
*
*   return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;
* });
* // => true

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+ 5 other calls in file

AlarmManager2.js

GitHub: firewalla/firewalla

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}

async deleteMacRelatedAlarms(mac) {
  let alarms = await this.loadRecentAlarmsAsync(60 * 60 * 24 * 7);
  let related = alarms
    .filter(alarm => _.isString(alarm['p.device.mac']) &&
      alarm['p.device.mac'].toUpperCase() === mac.toUpperCase())
    .map(alarm => alarm.aid);

  if (related.length) {

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Ai Example

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import { isString } from "lodash";

console.log(isString("hello")); // true
console.log(isString(42)); // false
console.log(isString(["foo", "bar"])); // false

In this example, we first import the isString function from the lodash library. We then call isString with three different arguments: the string 'hello', the number 42, and an array ['foo', 'bar']. In the first call to isString, the argument is a string, so isString returns true. In the second call to isString, the argument is a number, which is not a string. isString therefore returns false. In the third call to isString, the argument is an array, which is not a string. isString therefore returns false. This code demonstrates how lodash.isString can be used to check if a given value is a string.

config.js

GitHub: alphagov/govuk-prototype-kit

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    }
  }
  return {}
}


const asNumber = inputString => isString(inputString) ? Number(inputString) : inputString
const asBoolean = inputString => isString(inputString) ? inputString.toLowerCase() === 'true' : inputString
const asString = inputString => inputString
const asJson = inputString => isString(inputString) ? JSON.parse(inputString) : inputString

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+ 2 other calls in file

domains.js

GitHub: forwardemail/forwardemail.net

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});


async function getVerificationResults(domain, resolver) {
  const verificationRecord = `${config.recordPrefix}-site-verification=${domain.verification_record}`;
  const verificationMarkdown = `<span class="markdown-body ml-0 mr-0"><code>${verificationRecord}</code></span>`;
  const isPaidPlan = _.isString(domain.plan) && domain.plan !== 'free';


  //
  // attempt to purge Cloudflare cache programmatically
  //

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lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.isPositive          = _.isPositive;
module.exports.isRegExp            = _.isRegExp;
module.exports.isSafeInteger       = _.isSafeInteger;
module.exports.isSequential        = _.isSequential;
module.exports.isSet               = _.isSet;
module.exports.isString            = _.isString;
module.exports.isSymbol            = _.isSymbol;
module.exports.isTypedArray        = _.isTypedArray;
module.exports.isUndefined         = _.isUndefined;
module.exports.isValidDate         = _.isValidDate;

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+ 92 other calls in file

scripts.js

GitHub: chrisbreiding/zunder

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  ],
}

const addBrowserifyConfig = (addBrowserifyConfigTo) => {
  _.each(addBrowserifyConfigTo, (pathOrOptions) => {
    const isSimple = _.isString(pathOrOptions)
    const filePath = isSimple ? pathOrOptions : pathOrOptions.path
    const options = isSimple ? defaultBrowserifyConfig : (pathOrOptions.options || defaultBrowserifyConfig)
    const packagePath = path.join(filePath, 'package.json')

ObjectUtils.js

GitHub: samkulkarni20/yugabyte-db

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export function isNonEmptyString(str) {
  return _.isString(str) && str.trim().length > 0;
}

export function isEmptyString(str) {
  return _.isString(str) && str.trim().length === 0;
}

export function removeNullProperties(obj) {
  for (const propName in obj) {

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+ 23 other calls in file

propertyFactory.js

GitHub: microsoft/FluidFramework

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 * @private
 */
_createProperty(in_typeid, in_context, in_initialProperties, in_scope) {
	const ifNotSingleOrUndefined = (in_context || "single") !== "single";
	ConsoleUtils.assert(
		ifNotSingleOrUndefined || _.isString(in_typeid),
		MSG.UNKNOWN_TYPEID_SPECIFIED + in_typeid,
	);
	let context = in_context;
	if (!context) {

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toPgn.js

GitHub: canboat/canboatjs

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  }
}


fieldTypeMappers['Date'] = (field, value) => {
  //console.log(`Date: ${value}`)
  if ( _.isString(value) ) {
    var date = new Date(value)
    return date.getTime() / 86400 / 1000
  }

+ 6 other calls in file

fromPgn.js

GitHub: canboat/canboatjs

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  value += field.Offset
}
if ( field.Resolution && typeof value === 'number' ) {
  var resolution = field.Resolution

  if ( _.isString(resolution) ) {
    resolution = Number.parseFloat(resolution)
  }

  value = (value * resolution)

utils.ts

GitHub: JamilOmar/lsc

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 * @param {string} filePath - The path to a JSON file
 * @returns {Object|undefined}
 */
export function readJSON(filePath: string) {
  assert.ok(
    _.isString(filePath) && !_.isEmpty(filePath),
    'readJSON: `filePath` must be a non-empty string',
  );

  filePath = path.resolve(filePath);

+ 5 other calls in file

utils.js

GitHub: bcgov/EDUC-STUDENT-ADMIN

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  }
}


function minify(obj, keys = ['documentData']) {
  return lodash.transform(obj, (result, value, key) =>
    result[key] = keys.includes(key) && lodash.isString(value) ? value.substring(0, 1) + ' ...' : value);
}


async function logResponseData(url, response, operationType) {
  log.info(`${operationType} Data Status for url ${url} :: is :: `, response.status);

jsHarmony.LoadModels.js

GitHub: apHarmony/jsharmony

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  if ((prop in model) && (prop in parent)) mergedprops[prop] = mergefunc(model[prop], parent[prop]);
}


exports.MergeModelArray = function(newval, oldval, eachItem){
  var _this = this;
  if(!newval || _.isString(newval)) return newval;


  try{
    var rslt = newval.slice(0);
  }

fieldsAnt.cjs.js

GitHub: mighty-justice/fields-ant

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  return _noopValidator.apply(this, arguments);
}


function getBtnClassName(action, classNameSuffix, title) {
  var prefix = "btn-".concat(action);
  return cx(prefix, lodash.isString(title) && "".concat(prefix, "-").concat(lodash.kebabCase(title)), _defineProperty({}, "".concat(prefix, "-").concat(classNameSuffix), !!classNameSuffix));
}
function formatClassNames(className) {
  var colon = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  var layout = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : LAYOUT_TYPES.VERTICAL;

SupportObjectGenerator.js

GitHub: DaTebe/destroyclaims

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if (_.isArray(reason) && !reason.every((r) => _.isString(r))) {
  throw new TypeError(
    "SupportObjectGenerator: all reasons in Array must be of type String"
  );
}
if (_.isArray(reason) && reason.every((r) => _.isString(r))) {
  this.#support.destroyReasons = [
    ...new Set([...this.#support.destroyReasons, ...reason]),
  ];
}

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(isSafeInteger); // => true


const isSet = _.isSet(new Set);
console.log(isSet); // => true


const isString = _.isString('abc');
console.log(isString); // => true


const isSymbol = _.isSymbol(Symbol.iterator);
console.log(isSymbol); // => true

+ 15 other calls in file

db.js

GitHub: sdaigle2/Abacus-mvp

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 * Destroy Docs: https://github.com/apache/couchdb-nano#dbdestroydocname-rev-callback
 */
// _.forEach(EXPORTED_DBS, db => {
//   db.deleteDoc = function (docID, docRev, cb) {
//     var givenDocID = _.isString(docID) || _.isNumber(docID);
//     var givenDocRev = _.isString(docRev);
//     var givenCallback = _.isFunction(cb);


//     if (givenDocID && givenDocRev && givenCallback) {
//       db.destroy(docID, docRev, cb);

+ 25 other calls in file

router.js

GitHub: enyosolutions-team/axel-core

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// LOADING THE * policy in policies folder
if (axel.config.policies['*']) {
  if (Array.isArray(axel.config.policies['*'])) {
    policies = policies.concat(axel.config.policies['*']);
  } else if (
    _.isString(axel.config.policies['*'])
    || _.isFunction(axel.config.policies['*'])
  ) {
    policies.push(axel.config.policies['*']);
  }

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