as-string-sink

    0.4.2 • Public • Published

    String Sink

    Build Status npm

    An efficient dynamically sized string buffer (aka String Builder) for AssemblyScript.

    Interface

    class StringSink {
      static withCapacity(capacity: i32)
    
      constructor(initial: string = "", capacity: i32 = 32)
    
      get length(): i32
      get capacity(): i32
    
      write(src: string, start?: i32, end?: i32): void
      writeLn(src: string, start?: i32, end?: i32): void
      writeCodePoint(code: i32): void
    
      reserve(capacity: i32, clear?: bool): void
      shrink(): void
      clear(): void
    
      toString(): string
    }

    Benchmark Results

    StringSink can be up to 8700 times faster than native string concatenation!

    100 strings:
    ------------
    String += JS:  0.013 ms
    String += AS:  0.017 ms
    StringSink AS: 0.0034 ms
    
    50,000 strings:
    ---------------
    String += JS:  3.89 ms
    String += AS:  1219.44 ms
    StringSink AS: 0.54 ms
    
    200,000 strings:
    ----------------
    String += JS:  11.29 ms
    String += AS:  18360.15 ms
    StringSink AS: 2.28 ms

    Usage 1. String accumulation (+=)

    non efficient example:

    function toList(arr: string[]): string {
      let res = "";
      for (let i = 0, len = arr.length; i < len; i++) {
        res += arr[i] + "\n";
      }
      return res;
    }

    efficient with StringSink:

    function toList(arr: string[]): string {
      let res = new StringSink();
      for (let i = 0, len = arr.length; i < len; i++) {
        res.write(arr[i] + "\n");
      }
      return res.toString();
    }

    even more efficient:

    function toList(arr: string[]): string {
      let res = new StringSink();
      for (let i = 0, len = arr.length; i < len; i++) {
        res.writeLn(arr[i]);
      }
      return res.toString();
    }

    Usage 2. String accumulation (+=) only part of string

    non efficient example:

    function toListSliced(arr: string[]): string {
      let res = "";
      for (let i = 0, len = arr.length; i < len; i++) {
        res += arr[i].substring(1, 3);
      }
      return res;
    }

    more efficient with StringSink:

    function toListSliced(arr: string[]): string {
      let res = new StringSink();
      for (let i = 0, len = arr.length; i < len; i++) {
        res.write(arr[i], 1, 3);
      }
      return res.toString();
    }

    Install

    npm i as-string-sink

    DownloadsWeekly Downloads

    1

    Version

    0.4.2

    License

    MIT

    Unpacked Size

    673 kB

    Total Files

    13

    Last publish

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