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    <pre><code>function read_file(file, delete_after) { delete_after = delete_after || "my default here"; //rest of code } </code></pre> <p>This assigns to <code>delete_after</code> the value of <code>delete_after</code> if it is not a <em>falsey</em> value otherwise it assigns the string <code>"my default here"</code>. For more detail, check out <a href="http://crockford.com/javascript/survey.html" rel="noreferrer">Doug Crockford's survey of the language and check out the section on Operators</a>.</p> <p>This approach does not work if you want to pass in a <em>falsey</em> value i.e. <code>false</code>, <code>null</code>, <code>undefined</code>, <code>0</code> or <code>""</code>. If you require <em>falsey</em> values to be passed in you would need to use the method in <a href="https://stackoverflow.com/questions/894860/how-do-i-make-a-default-value-for-a-parameter-to-a-javascript-function/894877#894877">Tom Ritter's answer</a>.</p> <p>When dealing with a number of parameters to a function, it is often useful to allow the consumer to pass the parameter arguments in an object and then <em>merge</em> these values with an object that contains the default values for the function</p> <pre><code>function read_file(values) { values = merge({ delete_after : "my default here" }, values || {}); // rest of code } // simple implementation based on $.extend() from jQuery function merge() { var obj, name, copy, target = arguments[0] || {}, i = 1, length = arguments.length; for (; i &lt; length; i++) { if ((obj = arguments[i]) != null) { for (name in obj) { copy = obj[name]; if (target === copy) { continue; } else if (copy !== undefined) { target[name] = copy; } } } } return target; }; </code></pre> <p>to use</p> <pre><code>// will use the default delete_after value read_file({ file: "my file" }); // will override default delete_after value read_file({ file: "my file", delete_after: "my value" }); </code></pre>
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    1. POSet a default parameter value for a JavaScript function
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    1. COI find this insufficient, because I may want to pass in false.
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    2. COI find it's adequate for most situations
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    3. COThis also doesn't work for 0. :(
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