function str2bigInt(s, base, minSize) {
var d, i, j, x, y, kk;
var k = s.length;
if (base == -1) { //comma-separated list of array elements in decimal
x = new Array(0);
for (;;) {
y = new Array(x.length + 1);
for (i = 0; i < x.length; i++)
y[i + 1] = x[i];
y[0] = parseInt(s, 10);
x = y;
d = s.indexOf(',', 0);
if (d < 1) break;
s = s.substring(d + 1);
if (s.length == 0) break;
}
if (x.length < minSize) {
y = new Array(minSize);
copy_(y, x);
return y;
}
return x;
}
function copy_(x,y) {
var i;
var k=x.length<y.length ? x.length : y.length;
for (i=0;i<k;i++)
x[i]=y[i];
for (i=k;i<x.length;i++)
x[i]=0;
}
console.log( new str2bigInt("1234567890123456789012345678901234567890",-1))
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