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get_state,set_state proposal #3

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get_state,set_state proposal #3

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19 changes: 18 additions & 1 deletion index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ module.exports = function(seed, options) {
// This function returns a random double in [0, 1) that contains
// randomness in every bit of the mantissa of the IEEE 754 value.

return function() { // Closure to return a random double:
var ret = function() { // Closure to return a random double:
var n = arc4.g(chunks), // Start with a numerator n < 2 ^ 48
d = startdenom, // and denominator d = 2 ^ 48.
x = 0; // and no 'extra last byte'.
Expand All @@ -63,6 +63,23 @@ module.exports = function(seed, options) {
}
return (n + x) / d; // Form the number within [0, 1).
};
ret.get_state = function(){
return {
i : arc4.i,
j : arc4.j,
S : arc4.S.slice()
};
}
ret.set_state = function(state){
arc4.i = state.i;
arc4.j = state.j;
// arc4.S = state.S.slice(); // fast but memory non friendly
for(var i=0,_ref=state.S,len=_ref.length;i<len;i++) {
arc4.S[i] = _ref[i];
}
}

return ret;
};

module.exports.resetGlobal = function () {
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