--- id: 587d7b88367417b2b2512b46 title: Set Default Parameters for Your Functions challengeType: 1 forumTopicId: 301209 --- ## Description <section id='description'> In order to help us create more flexible functions, ES6 introduces <dfn>default parameters</dfn> for functions. Check out this code: ```js const greeting = (name = "Anonymous") => "Hello " + name; console.log(greeting("John")); // Hello John console.log(greeting()); // Hello Anonymous ``` The default parameter kicks in when the argument is not specified (it is undefined). As you can see in the example above, the parameter <code>name</code> will receive its default value <code>"Anonymous"</code> when you do not provide a value for the parameter. You can add default values for as many parameters as you want. </section> ## Instructions <section id='instructions'> Modify the function <code>increment</code> by adding default parameters so that it will add 1 to <code>number</code> if <code>value</code> is not specified. </section> ## Tests <section id='tests'> ```yml tests: - text: The result of <code>increment(5, 2)</code> should be <code>7</code>. testString: assert(increment(5, 2) === 7); - text: The result of <code>increment(5)</code> should be <code>6</code>. testString: assert(increment(5) === 6); - text: A default parameter value of <code>1</code> should be used for <code>value</code>. testString: assert(code.match(/value\s*=\s*1/g)); ``` </section> ## Challenge Seed <section id='challengeSeed'> <div id='js-seed'> ```js // Only change code below this line const increment = (number, value) => number + value; // Only change code above this line ``` </div> </section> ## Solution <section id='solution'> ```js const increment = (number, value = 1) => number + value; ``` </section>