How to Calculate the Byte Size of JavaScript Strings?

Determining Byte Size of JavaScript Strings

When working with JavaScript strings, it's crucial to understand their size implications. While JavaScript typically uses UCS-2 encoding, the actual size may vary depending on several factors.

Calculating String Size in Bytes

To determine the size of a JavaScript string in bytes, you can utilize the Blob object. The Blob constructor takes an array of strings as input and creates a binary representation of the data. The size property of the Blob object represents the size of the data in bytes.

Examples of Byte Size Calculation

Here are some examples illustrating how to calculate the byte size of strings using the Blob object:

<code class="js">console.info(
  new Blob(['?']).size,                             // 4
  new Blob(['?']).size,                             // 4
  new Blob(['??']).size,                           // 8
  new Blob(['??']).size,                           // 8
  new Blob(['I\'m a string']).size,                  // 12

  // For strings with lone characters in the surrogate pair range:
  new Blob([String.fromCharCode(55555)]).size,       // 3
  new Blob([String.fromCharCode(55555, 57000)]).size // 4 (not 6)
);</code>

These examples demonstrate that the byte size of JavaScript strings is not always straightforward and can vary depending on the characters and their encoding.

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