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Units module #2

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918710f
Add stub and tests
tshemsedinov Oct 22, 2019
31364a2
Implement units module
tshemsedinov Oct 22, 2019
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162 changes: 162 additions & 0 deletions JavaScript/3-units.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,162 @@
'use strict';

const DURATION_UNITS = {
days: { rx: /(\d+)\s*d/, mul: 86400 },
hours: { rx: /(\d+)\s*h/, mul: 3600 },
minutes: { rx: /(\d+)\s*m/, mul: 60 },
seconds: { rx: /(\d+)\s*s/, mul: 1 }
};
Comment on lines +3 to +8

@tshemsedinov tshemsedinov Oct 22, 2019

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Let's start with different data structure for this function

const DURATION_UNITS = {
  d: 86400,
  h: 3600,
  m: 60,
  s: 1,
};


// Parse duration string to seconds
// Example: duration('1d 10h 7m 13s')
const duration = s => {
if (typeof(s) === 'number') return s;
let result = 0;
let unit, match, key;
if (typeof(s) === 'string') {
for (key in DURATION_UNITS) {
unit = DURATION_UNITS[key];
match = s.match(unit.rx);
if (match) result += parseInt(match[1], 10) * unit.mul;
}
}
return result * 1000;
};

// Convert bytes: Number to size: String with nearest units: Kb, Mb, Gb...
const bytesToSize = bytes => {
if (bytes === 0) return '0';
const i = parseInt(Math.floor(Math.log(bytes) / Math.log(1000)), 10);
return (
Math.round(bytes / Math.pow(1000, i), 2) +
bytesToSize.sizes[i]
);
};

bytesToSize.sizes = [
'', ' Kb', ' Mb', ' Gb', ' Tb', ' Pb', ' Eb', ' Zb', ' Yb'
];

// Parse units and convert size: String to bytes: Number
const sizeToBytes = size => {
if (typeof(size) === 'number') return size;
size = size.toUpperCase();
let result = 0;
const units = sizeToBytes.units;
if (typeof(size) === 'string') {
let key, unit, match;
let found = false;
for (key in units) {
unit = units[key];
match = size.match(unit.rx);
if (match) {
result += parseInt(match[1], 10) * Math.pow(10, unit.pow);
found = true;
}
}
if (!found) result = parseInt(size, 10);
}
return result;
};

sizeToBytes.units = {
yb: { rx: /(\d+)\s*YB/, pow: 24 },
zb: { rx: /(\d+)\s*ZB/, pow: 21 },
eb: { rx: /(\d+)\s*EB/, pow: 18 },
pb: { rx: /(\d+)\s*PB/, pow: 15 },
tb: { rx: /(\d+)\s*TB/, pow: 12 },
gb: { rx: /(\d+)\s*GB/, pow: 9 },
mb: { rx: /(\d+)\s*MB/, pow: 6 },
kb: { rx: /(\d+)\s*KB/, pow: 3 }
};

// Tests

const assert = require('assert').strict;

// Target: duration
{
const cases = [
['1d', 86400000],
['2d', 172800000],
['10h', 36000000],
['7m', 420000],
['13s', 13000],
['2d 43s', 172843000],
['5d 17h 52m 1s', 496321000],
['1d 10h 7m 13s', 122833000],
['1s', 1000],
[500, 500],
[0, 0],
['', 0],
['15', 0],
['10q', 0],
[null, 0],
[undefined, 0],
];
for (const [arg, expected] of cases) {
const result = duration(arg);
assert.equal(result, expected);
}
}

// Target: bytesToSize
{
const cases = [
[0, '0'],
[1, '1'],
[100, '100'],
[999, '999'],
[1000, '1 Kb'],
[1023, '1 Kb'],
[1024, '1 Kb'],
[1025, '1 Kb'],
[1111, '1 Kb'],
[2222, '2 Kb'],
[10000, '10 Kb'],
[1000000, '1 Mb'],
[100000000, '100 Mb'],
[10000000000, '10 Gb'],
[1000000000000, '1 Tb'],
[100000000000000, '100 Tb'],
[10000000000000000, '10 Pb'],
[1000000000000000000, '1 Eb'],
[100000000000000000000, '100 Eb'],
[10000000000000000000000, '10 Zb'],
[1000000000000000000000000, '1 Yb'],
];
for (const [arg, expected] of cases) {
const result = bytesToSize(arg);
assert.equal(result, expected);
}
}

// Target: sizeToBytes
{
const cases = [
['', NaN],
[0, 0],
['0', 0],
['1', 1],
[512, 512],
['100', 100],
['999', 999],
['1 Kb', 1000],
['2 Kb', 2000],
['10 Kb', 10000],
['1 Mb', 1000000],
['100 Mb', 100000000],
['10 Gb', 10000000000],
['1 Tb', 1000000000000],
['100 Tb', 100000000000000],
['10 Pb', 10000000000000000],
['1 Eb', 1000000000000000000],
['100 Eb', 100000000000000000000],
['10 Zb', 10000000000000000000000],
['1 Yb', 1000000000000000000000000],
];
for (const [arg, expected] of cases) {
const result = sizeToBytes(arg);
assert.equal(result, expected);
}
}