|
1
|
function is_undef(value) { return typeof value === 'undefined' }
|
|
2
|
|
|
3
|
function coalesce(value, empty) { return !is_undef(value) ? value : empty }
|
|
4
|
|
|
5
|
function starts_with(str, prefix)
|
|
6
|
{
|
|
7
|
return str.substr(0, prefix.length) === prefix
|
|
8
|
}
|
|
9
|
|
|
10
|
function ends_with(str, suffix) { return str.substr(-suffix.length) === suffix }
|
|
11
|
|
|
12
|
function rm_prefix(prefix, str)
|
|
13
|
{
|
|
14
|
return starts_with(str, prefix) ? str.substr(prefix.length) : str
|
|
15
|
}
|
|
16
|
|
|
17
|
function rm_suffix(suffix, str)
|
|
18
|
{
|
|
19
|
return ends_with(str, suffix) ?
|
|
20
|
str.substr(0, str.length - suffix.length) : str
|
|
21
|
}
|
|
22
|
|
|
23
|
function partition(str, delim)
|
|
24
|
{
|
|
25
|
var delim_idx = str.indexOf(delim)
|
|
26
|
return delim_idx >= 0 ? {head: str.substr(0, delim_idx),
|
|
27
|
tail: str.substr(delim_idx+delim.length)} : {head: str, tail: ''}
|
|
28
|
}
|
