JavaScript
var milkInGrams = 50;
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Result
- Calculate the caloric value of Muffin’s breakfast. To do this, save the result of the milkInGrams * (42 / 100) expression in variable breakfastCalories
- and then log breakfastCalories variable in the console.
- Find out how many grams of food Muffin can eat for lunch and dinner if his daily limit is 500 calories. In order to do that, save the result of the (500 - breakfastCalories) / 4 expression to the dryFeedInGrams variable (1 gram of food contains around 4 calories).
- Output the dryFeedInGrams variable to the console.
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3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Operations order</h1><div class="course-theory__content-text"><p>I hope you had no problems with the last task where you had to write the following code:</p><pre><code>console.log(milkInGrams + waterInGrams - 150);</code></pre><p>You can use several operations in a single command. The order of operation execution will depend on their priorities.</p><p>If an expression only contains arithmetic operations, their priority will be the same as taught at school: multiplication and division have the highest priority, addition and subtraction have the lowest one.</p><p>You can change the priority and the order of execution using round brackets. For example:</p><pre><code>100 + 50 / 2; // result is 125
(100 + 50) / 2; // result is 75</code></pre><p>Of course, complex calculations can be simplified by breaking them down into several steps. For example, we could save the results of an operation into an intermediate variable and use it on the next step:</p><pre><code>// This code will produce the same result
var totalWaterInGrams = milkInGrams + waterInGrams;
console.log(totalWaterInGrams - 150);
// as this one
console.log(milkInGrams + waterInGrams - 150);</code></pre><p>It’s up to the developer if they want to use complex expressions made up of several operations or break the solution down into several steps consisting of simple operations. However, there is a golden rule: the simpler the code, the better.</p><p>Let’s try using more complex expressions.</p></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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Run</button></div><div class="course-browser__content"><div class="console js--console"><h2 class="sr-only">Result</h2><div class="console__content js--console__content"></div></div></div><div class="course-goals js--goals"><div class="course-goals__heading"><span class="course-goals__heading-title"><span class="course-goals__count-label">Goals</span><span class="course-goals__count">completed</span></span><button class="course-goals__button course-goals__button--expand js--goals__expand" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-collapse"></use></svg></button><a class="course-goals__button course-goals__button--next button button--green button--without-border hidden" href="/courses/javascript-programming/intro/more-operations" title="A few more operations"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#arrow-white--mini"></use></svg></a></div><div class="course-goals__content"><ol class="course-goals__list"><li class="course-goals__list-item">Calculate the caloric value of Muffin’s breakfast. To do this, save the result of the <code>milkInGrams * (42 / 100)</code> expression in variable <code>breakfastCalories</code></li><li class="course-goals__list-item">and then log <code>breakfastCalories</code> variable in the console.</li><li class="course-goals__list-item">Find out how many grams of food Muffin can eat for lunch and dinner if his daily limit is <code>500</code> calories. In order to do that, save the result of the <code>(500 - breakfastCalories) / 4</code> expression to the <code>dryFeedInGrams</code> variable <small>(1 gram of food contains around 4 calories)</small>.</li><li class="course-goals__list-item">Output the <code>dryFeedInGrams</code> variable to the console.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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