How to use

isString

function

in

lodash

_label(option) {
  if (!option) {
   return option;
  }

  if (isString(option)) {
   return option;
  }

  return option.label;
 }

export function weight(rawValue) {

  if (!isNumber(rawValue) && !isString(rawValue))
    return undefined;

  let value = Number(rawValue);

  if (!isFinite(value))
    return undefined;

  return new StyleWeight(value);

}

export function length(rawValue) {

  if (rawValue instanceof StyleLength && !rawValue.isRelative)
    return rawValue;

  if (!isNumber(rawValue) && !isString(rawValue))
    return undefined;

  let value = Number(rawValue);

  if (!isFinite(value))
    return undefined;

  return new StyleLength(value);

}

string(value, schema) {
    const emptyError = checkEmpty(value, schema.required);
    if (!isNil(emptyError)) return emptyError;

    const err = [];

    if (!isString(value)) err.push('This is not a text!');

    return err;
  }

it('should implement a generator', () => {
    s.def('::ingredient2', s.cat(':quantity', isInteger, ':unit', isString));

    expect(s.exercise('::ingredient2', 7)).to.have.length(7)
      .to.satisfy(sample => every(sample, ([[v1, v2]]) => isInteger(v1) || isString(v2)));
  });

extractName(command) {
    if (isObject(command) === false ||
      isString(command.constructor.name) === false
    ) {
      throw new InvalidCommandException('Invalid Command Name.');
    }

    return command.constructor.name;
  }

// eslint-disable-next-line require-jsdoc
  constructor(fields) {
    this._fields = {};
    this._highlight = { fields: this._fields };

    // Does this smell?
    if (isNil(fields)) return;

    if (isString(fields)) this.field(fields);
    else this.fields(fields);
  }

function writeWrap(writeFunc) {
  return function (chunk, enc, next) {
    if (!isString(chunk)) {
      // chunk is a buffer, convert it to string
      writeFunc(chunk.toString());
    } else {
      writeFunc(chunk);
    }

    return next();
  };
}

hasDeclaredEvent(name) {

    if (!isString(name))
      throw new Error(`Failed to execute 'hasDeclaredEvent': Parameter 1 is not of type 'string'.`);

    return this.listeners.has(name);

  }

const allBlanks = o => {
  if(isString(o) === false) {
    return false;
  }
  return emptyString(o) ? false : every(blankString, o.split(''))
}

static extractMessageId (body) {
  if (!body || !isString(body.message_id)) {
   return null;
  }
  return body.message_id;
 }

/**
 * Check if string is HEX, requires a 0x in front
 *
 * @public
 * @static
 * @method isHexStrict
 * @param {String} hex to be checked
 * @returns {Boolean}
 */
const isHexStrict = hex => (isString(hex) || isNumber(hex)) && /^(-)?0x[0-9a-f]*$/i.test(hex)

export function character(rawValue) {

  if (!isString(rawValue) || rawValue.length !== 1)
    return undefined;

  return rawValue;

}

export function number(rawValue) {

  if (!isNumber(rawValue) && !isString(rawValue))
    return undefined;

  let value = Number(rawValue);

  if (!isFinite(value))
    return undefined;

  return value;

}

_label(option) {
  if (!option) {
   return option;
  }

  if (isString(option)) {
   return option;
  }

  return option.label;
 }