text: 'use strict';
  
  /*
   * Create a `keepFirst` function that takes a string as parameter
   * and return the string only keeping the 2 first characters
   *
   * Create a `keepLast` function that takes a string as parameter
   * and return the string only keeping the 2 last characters
   *
   * Create a `keepFirstLast` function that takes a string as parameter
   * and only keep 2 characters from the third character
   *
   */
  
  // Your code:
  function keepFirst(s) {return s.slice(0, 2)}
  function keepLast(s) {return s.slice(-2)}
  function keepFirstLast(s) {return keepFirst(s.slice(2))}
  
  //* Begin of tests
  const assert = require('assert');
  
  
  assert.strictEqual(typeof keepFirst, 'function');
  assert.strictEqual(keepFirst.length, 1);
  assert.deepStrictEqual(keepFirst('abcde'), 'ab');
  
  assert.strictEqual(typeof keepLast, 'function');
  assert.strictEqual(keepLast.length, 1);
  assert.deepStrictEqual(keepLast('abcde'), 'de');
  
  assert.strictEqual(typeof keepFirstLast, 'function');
  assert.strictEqual(keepFirstLast.length, 1);
  assert.deepStrictEqual(keepFirstLast('abcde'), 'cd');
  // assert.fail('You must write your own tests');
  // End of tests */
  