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<!--replace-end-7--><!--replace-end-4--><!--replace-end-1--></head><body><div class="ui fluid container universe"><!--replace-start-2--><!--replace-start-3--><!--replace-start-6--><div class="ui text container" id="zettel-container" style="position: relative"><div class="zettel-view"><article class="ui raised attached segment zettel-content"><div class="pandoc"><h1 id="title-h1">The call-stack</h1><p>A <span class="zettel-link-container cf"><span class="zettel-link" title="Zettel: Stacks"><a href="Stacks.html">stack</a></span></span> data structure that holds the information of the functions called within a program that allows transfer of the application control from these functions to the main process after code inside the functions has been executed.</p><h2 id="example">Example</h2><pre><code class="js language-js">function greet(who) {
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console.log("Hello " + who);
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}
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greet("Harry");
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console.log("Bye");</code></pre><h3 id="breakdown">Breakdown</h3><ol><li>Interpreter receives call to <code>greet()</code></li><li>Goes to the definition of this function (<code>function greet(who)...</code>)</li><li>Executes the <code>console.log</code> within this function</li><li>Returns to the location that called it (<code>greet("Harry")</code>)</li><li>Finds that there is nothing else to do in this function so moves to next function: the <code>console.log("bye")</code></li><li>Executes</li><li>Returns to line that called it. Finds nothing else to do. Exits program.</li></ol><h2 id="related-notes">Related notes</h2><p><img alt="Stack memory" src="/static/Stack_memory.md" /></p></div></article><nav class="ui attached segment deemphasized backlinksPane" id="neuron-backlinks-pane"><h3 class="ui header">Backlinks</h3><ul class="backlinks"><li><span class="zettel-link-container cf"><span class="zettel-link"><a href="Event_loop.html">The Event Loop</a></span></span><ul class="context-list" style="zoom: 85%;"><li class="item"><div class="pandoc"><p>The Event Loop comprises six phases. The Event Loop starts at the moment Node begins to execute your <code>index.js</code> file or any other application entry point. These six phases create one cycle, or loop, equal to one <strong>tick</strong>. A Node.js process exits when there is no more pending work in the Event Loop, or when <code>process.exit()</code> is called manually. A program only runs for as long as there are tasks queued in the Event Loop, or present on the <span class="zettel-link-container cf"><span class="zettel-link" title="Zettel: The call-stack"><a href="Call_stack.html">call stack</a></span></span>.</p></div></li><li class="item"><div class="pandoc">At the beginning of this phase the Event Loop updates its own time. Then it checks a queue, or pool, of timers. This queue consists of all timers that are currently set. The Event Loop takes the timer with the shortest wait time and compares it with the Event Loop’s current time. If the wait time has elapsed, then the timer’s callback is queued to be called once the <span class="zettel-link-container cf"><span class="zettel-link" title="Zettel: The call-stack"><a href="Call_stack.html">call stack</a></span></span> is empty.</div></li></ul></li></ul></nav><nav class="ui attached segment deemphasized bottomPane" id="neuron-tags-pane"><div><span class="ui basic label zettel-tag" title="Tag">javascript</span><span class="ui basic label zettel-tag" title="Tag">memory</span></div></nav><nav class="ui bottom attached icon compact inverted menu blue" id="neuron-nav-bar"><!--replace-start-9--><!--replace-end-9--><a class="right item" href="impulse.html" title="Open Impulse"><i class="wave square icon"></i></a></nav></div></div><!--replace-end-6--><!--replace-end-3--><!--replace-end-2--><div class="ui center aligned container footer-version"><div class="ui tiny image"><a href="https://neuron.zettel.page"><img alt="logo" src="https://raw.githubusercontent.com/srid/neuron/master/assets/neuron.svg" title="Generated by Neuron 1.9.35.3" /></a></div></div></div></body></html> |