How to use

hasIn

function

in

lodash

/**
   * Build and return muto syntax for Where Expression
   *
   * @returns {string} returns a string which maps to the muto syntax for
   * Where Expression
   */
  build() {
    const whereStr = this._conditions
      .map(cn => (hasIn(cn, 'build') ? cn.build() : cn))
      .join(` ${this._join} `);

    return `(${whereStr})`;
  }

// eslint-disable-next-line require-jsdoc
  constructor(prop, operator, value) {
    if (!isNil(prop)) this._prop = prop;

    if (!isNil(operator)) {
      if (
        operator !== 'prop' &&
        operator !== 'build' &&
        hasIn(this, operator) &&
        isFunction(this[operator])
      ) {
        this[operator](value);
      } else throw new Error(`Invalid operator '${operator}'!`);
    }
  }