Converting arraybuffer to string : Maximum call stack size exceeded

在轉換 arraybuffer 為 String 時, 出錯, length 小的時候, 不會出問題, 但大量時就出錯了:

Maximum call stack size exceeded

To work around the problem you could batch the calls to String.fromCharCode. Don’t call it just once, but call it once for every 1024 entries, for example, and then concatenate the resulting strings.

會造成錯誤的程式碼:

let data_array = pako.inflate(raw);
let str = String.fromCharCode.apply(null, new Uint16Array(data_array))

改寫成, 不會出錯的版本:

let str = '';
const chunk = 8 * 1024
let i;
for (i = 0; i < data_array.length / chunk; i++) {
	str += String.fromCharCode.apply(null, data_array.slice(i * chunk, (i + 1) * chunk));
}
str += String.fromCharCode.apply(null, data_array.slice(i * chunk));

相關討論:
Converting arraybuffer to string : Maximum call stack size exceeded
https://stackoverflow.com/questions/38432611/converting-arraybuffer-to-string-maximum-call-stack-size-exceeded

I finally used this code:

function _arrayBufferToBase64( buffer ) {
    var binary = '';
    var bytes = new Uint8Array( buffer );
    var len = bytes.byteLength;
    for (var i = 0; i < len; i++) {
        binary += String.fromCharCode( bytes[ i ] );
    }
    return window.btoa( binary );
}