25 lines
502 B
JavaScript
25 lines
502 B
JavaScript
var IDX=256, HEX=[], BUFFER;
|
|
while (IDX--) HEX[IDX] = (IDX + 256).toString(16).substring(1);
|
|
|
|
export function v4() {
|
|
var i=0, num, out='';
|
|
|
|
if (!BUFFER || ((IDX + 16) > 256)) {
|
|
BUFFER = Array(i=256);
|
|
while (i--) BUFFER[i] = 256 * Math.random() | 0;
|
|
i = IDX = 0;
|
|
}
|
|
|
|
for (; i < 16; i++) {
|
|
num = BUFFER[IDX + i];
|
|
if (i==6) out += HEX[num & 15 | 64];
|
|
else if (i==8) out += HEX[num & 63 | 128];
|
|
else out += HEX[num];
|
|
|
|
if (i & 1 && i > 1 && i < 11) out += '-';
|
|
}
|
|
|
|
IDX++;
|
|
return out;
|
|
}
|