js-name-escape

Escape strings to be used as javascript names.

Installation

npm i js-name-escape

Format

All characters except a-z, A-Z and _ are replaced with $x_ where x is the hexadecimal unicode code point.

Usage

import {escape, unescape} from 'js-name-escape'
 
escape('Hello World!') // -> Hello$20_World$21_
 
unescape('Hello$20_World$21_') // -> Hello World!

Inversion

Please note that unescape is not the full inverse of escape since invalid or partial escape codes are ignored when unescaping.

// For any given string, the following is true:
unescape(escape(x)) === x
// Example: foo! --> foo$21_ --> foo!
 
// but the following may be false:
escape(unescape(x)) === x
// Example: $bar --> $bar --> $21_bar

Benchmarks

The following are the latest benchmark results:

Node 10.9 (Windows 10 / 4.8GHz)
    escape 32 chars x 314,639 ops/sec ±4.75% (93 runs sampled)
    unescape 32 chars x 609,117 ops/sec ±1.19% (96 runs sampled)

Node 10.9 (Ubuntu 18 / 4.8GHz)
    escape 32 chars x 472,569 ops/sec ±4.84% (93 runs sampled)
    unescape 32 chars x 687,177 ops/sec ±1.01% (99 runs sampled)