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    <p><strong>ECMAScript 2018 Standard Method</strong></p> <p>You would use <a href="https://github.com/tc39/proposal-object-rest-spread" rel="noreferrer">object spread</a>:</p> <pre><code>let merged = {...obj1, ...obj2}; /** There's no limit to the number of objects you can merge. * Later properties overwrite earlier properties with the same name. */ const allRules = {...obj1, ...obj2, ...obj3}; </code></pre> <p><strong>ECMAScript 2015 (ES6) Standard Method</strong></p> <pre><code>/* For the case in question, you would do: */ Object.assign(obj1, obj2); /** There's no limit to the number of objects you can merge. * All objects get merged into the first object. * Only the object in the first argument is mutated and returned. * Later properties overwrite earlier properties with the same name. */ const allRules = Object.assign({}, obj1, obj2, obj3, etc); </code></pre> <p>(see <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Browser_compatibility" rel="noreferrer">MDN JavaScript Reference</a>)</p> <hr> <p><strong>Method for ES5 and Earlier</strong></p> <pre><code>for (var attrname in obj2) { obj1[attrname] = obj2[attrname]; } </code></pre> <p>Note that this will simply add all attributes of <code>obj2</code> to <code>obj1</code> which might not be what you want if you still want to use the unmodified <code>obj1</code>.</p> <p>If you're using a framework that craps all over your prototypes then you have to get fancier with checks like <code>hasOwnProperty</code>, but that code will work for 99% of cases.</p> <p>Example function:</p> <pre><code>/** * Overwrites obj1's values with obj2's and adds obj2's if non existent in obj1 * @param obj1 * @param obj2 * @returns obj3 a new object based on obj1 and obj2 */ function merge_options(obj1,obj2){ var obj3 = {}; for (var attrname in obj1) { obj3[attrname] = obj1[attrname]; } for (var attrname in obj2) { obj3[attrname] = obj2[attrname]; } return obj3; } </code></pre>
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    1. POHow can I merge properties of two JavaScript objects dynamically?
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    1. USFelix Kling
    1. USJohn Millikin
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    1. POHow can I merge properties of two JavaScript objects dynamically?
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    1. COThis doesn't work if objects have same name attributes, and you would also want to merge the attributes.
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      1. USXiè Jìléi
    2. COThis only does a shallow copy/merge. Has the potential to clobber a lot of elements.
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      1. USJay Taylor
 

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