--- id: 56533eb9ac21ba0edf2244ad title: Decrement a Number with JavaScript challengeType: 1 videoUrl: 'https://scrimba.com/c/cM2KeS2' forumTopicId: 17558 --- ## Description <section id='description'> You can easily <dfn>decrement</dfn> or decrease a variable by one with the <code>--</code> operator. <code>i--;</code> is the equivalent of <code>i = i - 1;</code> <strong>Note</strong><br>The entire line becomes <code>i--;</code>, eliminating the need for the equal sign. </section> ## Instructions <section id='instructions'> Change the code to use the <code>--</code> operator on <code>myVar</code>. </section> ## Tests <section id='tests'> ```yml tests: - text: <code>myVar</code> should equal <code>10</code> testString: assert(myVar === 10); - text: <code>myVar = myVar - 1;</code> should be changed testString: assert(/var\s*myVar\s*=\s*11;\s*\/*.*\s*([-]{2}\s*myVar|myVar\s*[-]{2});/.test(code)); - text: Use the <code>--</code> operator on <code>myVar</code> testString: assert(/[-]{2}\s*myVar|myVar\s*[-]{2}/.test(code)); - text: Do not change code above the line testString: assert(/var myVar = 11;/.test(code)); ``` </section> ## Challenge Seed <section id='challengeSeed'> <div id='js-seed'> ```js var myVar = 11; // Only change code below this line myVar = myVar - 1; ``` </div> ### After Test <div id='js-teardown'> ```js (function(z){return 'myVar = ' + z;})(myVar); ``` </div> </section> ## Solution <section id='solution'> ```js var myVar = 11; myVar--; ``` </section>