What if the decision does not depend on one, but on two or more conditions? You can use one if, and then, if the condition is fulfilled, execute one more condition inside the nested if:
if (condition1) {
if (condition2) {
actions;
}
}
Then within the second check you can perform the third one and so on indefinitely.
Let’s continue writing the program “Can I start the project”, which became really complicated. Now you can proceed to the project if two conditions are met:
- there are enough developers: variable enoughDevelopers;
- and the developers have the knowledge of the required technologies: variable techAvailable.
If there are enough developers and if the required technology is mastered, we log the message “You can start the project”, otherwise the message remains unchanged: “You cannot start the project”.
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Simple fork</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/if-else">2. Let’s use an alternative</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/simple-compare">3. Simple comparisons</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/or-equal">4. Comparisons permitting equality</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/equality">5. Equality, inequality</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/string-compare">6. Strict string comparison</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/numeric-compare">7. Strict number comparison</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/then-action">8. Condition-based actions</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/else-action">9. If the condition is not fulfilled</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/value-condition">10. Values as a condition</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-programming/conditions/nested-if">11. Nested conditions</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/and-or">12. Logical operators: &&, ||</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/negation">13. Logic traps</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-programming/conditions/nesting-deeper">14. 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2.334.725-.13.837-1.46.93-2.13h.112c.937.492 1.647 1.33 1.98 2.334-.388.176-.793.31-1.21.4zm18.365-2.864c-1.104-.145-2.215-.232-3.33-.26-.546-.01-1.093.05-1.626.176-1.166.483-2.08 1.425-2.53 2.604l-.158.79 1.795.623c.558.153 1.132.24 1.71.26h.28c3.245-.177 4.137-3.72 4.137-3.72l.084-.353zm-1.264 1.86c-.54 1.394-2.882 1.646-2.966 1.646-.517-.02-1.03-.11-1.525-.26-.186-.085-.633-.26-1.08-.43.374-.966 1.117-1.746 2.065-2.165 0 .68.158 1.953.81 2.083.65.13.613-1.535.566-2.26.934.005 1.865.064 2.79.177-.11.316-.473.65-.66 1.17z" fill="#151841"/><path d="M19.26 39.27c.535 1.362 1.56 2.473 2.874 3.115.534.312 1.204-.07 1.207-.69.002-.285-.15-.55-.397-.695-.918-.46-1.65-1.222-2.073-2.158-.344-.957-1.972-.52-1.61.428zm29.45 3.125c1.083-.59 2.01-1.428 2.706-2.446.3-.556-.112-1.228-.743-1.21-.293.007-.56.17-.698.428-.568.776-1.306 1.412-2.158 1.86-.394.23-.517.742-.27 1.125.263.376.773.482 1.163.242z" fill="#EFA75B" stroke-width="13"/><path d="M16.025 32.436c1.525-1.386 2.427-4.408 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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">Nested conditions</h1><div class="course-theory__content-text"><p>What if the decision does not depend on one, but on two or more conditions? You can use one <code>if</code>, and then, if the condition is fulfilled, execute one more condition inside the nested <code>if</code>:</p><pre><code>if (condition1) {
if (condition2) {
actions;
}
}</code></pre><p>Then within the second check you can perform the third one and so on indefinitely.</p><p>Let’s continue writing the program “Can I start the project”, which became really complicated. Now you can proceed to the project if two conditions are met:</p><ol><li>there are enough developers: variable <code>enoughDevelopers</code>;</li><li>and the developers have the knowledge of the required technologies: variable <code>techAvailable</code>.</li></ol><p>If there are enough developers and if the required technology is mastered, we log the message “You can start the project”, otherwise the message remains unchanged: “You cannot start the project”.</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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var techAvailable = false;
var message = 'You cannot start the project';
console.log(message);
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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/conditions/and-or" title="Logical operators: &&, ||"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#arrow-white--mini"></use></svg></a></div><div class="course-goals__content"><p>Let’s describe a compound condition using nested <code>if</code>.</p><ol class="course-goals__list"><li class="course-goals__list-item">Between declaring the <code>message</code> variable and logging in the console, add <code>if</code> with the <code>enoughDevelopers</code> condition<span class="mark">.</span></li><li class="course-goals__list-item">Inside the <code>if</code> block, add one more <code>if</code> with the <code>techAvailable</code> condition<span class="mark">.</span></li><li class="course-goals__list-item">Inside the block of the second <code>if</code>, add assignment <code>message = 'You can start the project';</code><span class="mark">.</span></li><li class="course-goals__list-item">Change the value of the <code>techAvailable</code> variable to <code>true</code>. The value of <code>message</code> should change.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
src="https://assets.htmlacademy.org/scripts/courses-spa/htmlacademy-task.v43.js"
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