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:
  const keepFirst = (str) => str.substring(0, 2);
  //* Begin of tests
  const assert = require("assert");
  
  assert.strictEqual(typeof keepFirst, "function");
  assert.deepStrictEqual(keepFirst("12345"), "12");
  // End of tests */
  