text: 'use strict';
  
  /*
   * Create a `concatStr` function that takes 2 arguments and concatenate them
   *
   * @notions Functions, Operators
   */
  
  // Your code:
  
  const concatStr = (a,b) =>{
    return a + b
  }
  
  //* Begin of tests
  const assert = require('assert');
  
  assert.strictEqual(typeof concatStr, 'function', 'Should be a function');
  assert.strictEqual(concatStr.length, 2, 'Should takes 2 arguments');
  assert.strictEqual(concatStr('a', 'b'), 'ab');
  assert.strictEqual(concatStr('yolo', 'swag'), 'yoloswag');
  // End of tests */
  