Noticed something potentially odd with JavaScript's sort()
method. Given the following array:
var arr = ['Aaa',
'CUSTREF',
'Copy a template',
'Copy of Statementsmm',
'Copy1 of Default Email Template',
'Copy11',
'Cust',
'Statements',
'zzzz'];
Calling sort on this array:
console.log(arr.sort());
Yields:
["Aaa", "CUSTREF", "Copy a template", "Copy of Statementsmm", "Copy1 of Default Email Template", "Copy11", "Cust", "Statements", "zzzz"]
Is this correct? ie. CUSTREF
is listed first, is this because of it's capital letters?
That is correct. The strings are being sorted in a binary fashion, using the ordinal values of the characters themselves.
For a case-insensitive sort, try this:
arr.sort(function(a,b) {
a = a.toLowerCase();
b = b.toLowerCase();
if( a == b) return 0;
return a < b ? -1 : 1;
});
You are correct, it is because of capital letters. If you are sorting strings which might have non ASCII characters such as ä and ö you should use String.localeCompare() . This also fixes the capital letter problem.
arr.sort(function (a, b) {
return a.localeCompare(b);
});
Yes, It has a higher Unicode value. (it = the 'U' in the first word)
you maybetter use
.sort(function(a,b) { return (a.toLowerCase() < b.toLowerCase()) ? -1 : 1;});
如果你看一下他们对字符进行编码的方式(例如ASCII表),你会看到,大写字母的值较低,小写一个,所以是 - 这是因为大写字母
Since U
(U+0055) has a lesser Unicode value than o
(U+006F), a case-sensitive sort
will always place U
before o
. For a case-insensitive sort
, you should try:
arr.sort(
function(a, b){
if (a.toLowerCase() < b.toLowerCase()) return -1;
if (a.toLowerCase() > b.toLowerCase()) return 1;
return 0;
}
);
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