This commit is contained in:
Jordi Baylina
2020-01-30 07:25:48 +01:00
parent a8d597d8c5
commit 111c91c70d
3 changed files with 74 additions and 13 deletions

59
src/bigarray.js Normal file
View File

@@ -0,0 +1,59 @@
const SUBARRAY_SIZE = 0x10000;
const BigArrayHandler = {
get: function(obj, prop) {
if (!isNaN(prop)) {
return obj.getElement(prop);
} else return obj[prop];
},
set: function(obj, prop, value) {
if (!isNaN(prop)) {
return obj.setElement(prop, value);
} else {
obj[prop] = value;
return true;
}
}
};
class _BigArray {
constructor (initSize) {
this.length = initSize || 0;
this.arr = [];
for (let i=0; i<initSize; i+=SUBARRAY_SIZE) {
this.arr[i/SUBARRAY_SIZE] = new Array(Math.min(SUBARRAY_SIZE, initSize - i));
}
return this;
}
push (element) {
this.setElement (this.length, element);
}
getElement(idx) {
idx = parseInt(idx);
const idx1 = Math.floor(idx / SUBARRAY_SIZE);
const idx2 = idx % SUBARRAY_SIZE;
return this.arr[idx1] ? this.arr[idx1][idx2] : undefined;
}
setElement(idx, value) {
idx = parseInt(idx);
const idx1 = Math.floor(idx / SUBARRAY_SIZE);
if (!this.arr[idx1]) {
this.arr[idx1] = [];
}
const idx2 = idx % SUBARRAY_SIZE;
this.arr[idx1][idx2] = value;
if (idx >= this.length) this.length = idx+1;
return true;
}
}
class BigArray {
constructor( initSize ) {
const obj = new _BigArray(initSize);
const extObj = new Proxy(obj, BigArrayHandler);
return extObj;
}
}
module.exports = BigArray;