-
Notifications
You must be signed in to change notification settings - Fork 0
/
blockman.js
60 lines (50 loc) · 1.65 KB
/
blockman.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
(function() {
'use strict';
module.exports.map =
(data, f) => {
var length = data.length,
size = f.length,
constructor = data.constructor || Array,
block;
if (length % size !== 0)
throw new Error('Array length must be divisible by iterator argument count.');
var result = new constructor(length);
for (var i = 0; i < length; i += size) {
block = f(...data.slice(i, i + size));
for (var j = 0; j < block.length; j++)
result[i + j] = block[j];
}
return result;
};
module.exports.expand =
(data, f) => {
var length = data.length,
size = f.length,
step = f().length,
constructor = data.constructor || Array,
block;
if (length % size !== 0)
throw new Error('Array length must be divisible by iterator argument count.');
var result = new constructor(length * (step / size));
for (var i = 0; i < length; i += size) {
block = data.slice(i, i + step);
block = f(...block);
for (var j = 0; j < step; j++)
result[i * (step / size) + j] = block[j];
}
return result;
};
module.exports.reduce =
(data, f) => {
var length = data.length,
size = f.length,
constructor = data.constructor || Array,
block;
if (length % size !== 0)
throw new Error('Array length must be divisible by iterator argument count.');
var result = new constructor(length / size);
for (var i = 0, j = 0; i < length; i += size, j++)
result[j] = f(...data.slice(i, i + size));
return result;
};
}());