GUIDES Optimizing Embedded JavaScript Appending to an Array
Moddable SDK 6.0.0
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Convert String to ArrayBuffer
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Optimizing Embedded JavaScript
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When to Optimize
Know Where to Optimize
Looping through an Array
Iterating Over a String
Building a String
Avoid Copying Buffers
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Map versus Object
Appending to an Array
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Appending to an Array

Scripts use push() to add one item to the end of an array. When there are several items to add to the array at once, it is common to use three calls to push().

Instead, you can add all of the items with a single call to push(). This eliminates the overhead of multiple function calls and only grows the array once instead of several times.

/* BEFORE */
array.push("one");
array.push("two");
array.push("three");

/* AFTER */
array.push("one", "two", "three");