for loops

src/utils.js

@@ -1,12 +1,16 @@
 const fnv = require("fnv-plus");
+const bigInt = require("big-integer");
 
 module.exports.ident =ident;
 
 module.exports.extractSizes =extractSizes;
+module.exports.flatArray = flatArray;
 module.exports.csArr = csArr;
 module.exports.subArray = subArray;
 module.exports.accSizes = accSizes;
 module.exports.fnvHash = fnvHash;
+module.exports.stringifyBigInts = stringifyBigInts;
+module.exports.unstringifyBigInts = unstringifyBigInts;
 
 function ident(text) {
     let lines = text.split("\n");
@@ -17,10 +21,26 @@ function ident(text) {
 }
 
 function extractSizes (o) {
-    if (! Array.isArray(o)) return [1, 0];
+    if (! Array.isArray(o)) return [];
     return [o.length, ...extractSizes(o[0])];
 }
 
+function flatArray(a) {
+    var res = [];
+    fillArray(res, a);
+    return res;
+
+    function fillArray(res, a) {
+        if (Array.isArray(a)) {
+            for (let i=0; i<a.length; i++) {
+                fillArray(res, a[i]);
+            }
+        } else {
+            res.push(a);
+        }
+    }
+}
+
 // Input [1,2,3]
 // Returns " ,1 ,2, 3"
 function csArr(_arr) {
@@ -53,3 +73,37 @@ function fnvHash(str) {
 
 
 
+function stringifyBigInts(o) {
+    if ((typeof(o) == "bigint") || o.isZero !== undefined)  {
+        return o.toString(10);
+    } else if (Array.isArray(o)) {
+        return o.map(stringifyBigInts);
+    } else if (typeof o == "object") {
+        const res = {};
+        for (let k in o) {
+            res[k] = stringifyBigInts(o[k]);
+        }
+        return res;
+    } else {
+        return o;
+    }
+}
+
+function unstringifyBigInts(o) {
+    if ((typeof(o) == "string") && (/^[0-9]+$/.test(o) ))  {
+        return bigInt(o);
+    } else if (Array.isArray(o)) {
+        return o.map(unstringifyBigInts);
+    } else if (typeof o == "object") {
+        const res = {};
+        for (let k in o) {
+            res[k] = unstringifyBigInts(o[k]);
+        }
+        return res;
+    } else {
+        return o;
+    }
+}
+
+
+