Sha256: 4b0afbc27d85460176ba57f620b172f1e4b730e8cc79cd830fa5371af9d7931a
Contents?: true
Size: 1.99 KB
Versions: 208
Compression:
Stored size: 1.99 KB
Contents
/**
* In JavaScript, integers beyond +/- 9007199254740991 cannot be accurately
* represented. To see this in action, console.log() out the expected number
* of grains on square #64:
*
* console.log(9223372036854775808);
* // => 9223372036854776000
* // ^^^^
*
* This is because, in JavaScript, integers are represented as 64-bit floating
* point numbers. If you want to learn more, see:
*
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER
* http://stackoverflow.com/questions/307179/what-is-javascripts-highest-integer-value-that-a-number-can-go-to-without-losin
*
* So, an accurate solution to this problem requires the use of a
* "big integer" type. There are multiple ways to use big integer types.
* We have provided you with BigInteger.js. You can read more about it here:
*
* https://github.com/peterolson/BigInteger.js
* ^--- The "Methods" section of the README will be especially helpful.
*
* https://github.com/peterolson/BigInteger.js/blob/master/spec/spec.js
* ^--- Tests are a good way to understand, in addition to the README.
*
* To get you started, this folder has a file of the big-integer module.
* See its tests in this folder for a quick primer on how to use it! ( :
*/
import Grains from './grains';
describe('Grains', () => {
const grains = new Grains();
it('square 1', () => {
expect(grains.square(1)).toBe('1');
});
xit('square 2', () => {
expect(grains.square(2)).toBe('2');
});
xit('square 3', () => {
expect(grains.square(3)).toBe('4');
});
xit('square 4', () => {
expect(grains.square(4)).toBe('8');
});
xit('square 16', () => {
expect(grains.square(16)).toBe('32768');
});
xit('square 32', () => {
expect(grains.square(32)).toBe('2147483648');
});
xit('square 64', () => {
expect(grains.square(64)).toBe('9223372036854775808');
});
xit('total', () => {
expect(grains.total()).toBe('18446744073709551615');
});
});
Version data entries
208 entries across 208 versions & 1 rubygems