Last active
December 29, 2016 22:39
-
-
Save s3rgeym/4f4030a73185311d91170da4b42bd27b to your computer and use it in GitHub Desktop.
Нестрогое сравнение в JavaScript
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
s='true,false,null,undefined,0,42,3.14159265359,NaN,Infinity,-Infinity' | |
a=s.split(',') | |
for x in a: | |
b.extend([x, ' \t\n' + x]) | |
if x.upper() != x: | |
b.append(x.upper()) | |
if x.lower() != x: | |
b.append(x.lower()) | |
for x in b: | |
print(' {!r}, '.format(x)) | |
*/ | |
var data=[ | |
// Boolean | |
true, | |
false, | |
new Boolean(true), | |
// Null | |
null, | |
// Undefined | |
undefined, | |
// Number | |
0, | |
42, | |
3.14159265359, | |
NaN, | |
Infinity, | |
-Infinity, | |
new Number(42), | |
// Object | |
{}, // empty plain object | |
{x:42}, // non-empty | |
// Array | |
[], | |
[42], | |
// Function | |
function(){}, | |
// String | |
'foo', | |
new String('foo'), | |
// Дальше пошли обычные типы в строковом представлении (+с пробельными | |
// символами и в разных регистрах) | |
'true', | |
' \t\ntrue', | |
'TRUE', | |
'false', | |
' \t\nfalse', | |
'FALSE', | |
'null', | |
' \t\nnull', | |
'NULL', | |
'undefined', | |
' \t\nundefined', | |
'UNDEFINED', | |
'0', | |
' \t\n0', | |
'42', | |
' \t\n42', | |
'3.14159265359', | |
' \t\n3.14159265359', | |
'NaN', | |
' \t\nNaN', | |
'NAN', | |
'nan', | |
'Infinity', | |
' \t\nInfinity', | |
'INFINITY', | |
'infinity', | |
'-Infinity', | |
' \t\n-Infinity', | |
'-INFINITY', | |
'-infinity', | |
]; | |
function repr(x){ | |
if (typeof x === 'string'){ | |
return "'" + x.replace(/\t/g, '\\t') | |
.replace(/\t/g, '\\t') | |
.replace(/\n/g, '\\n') | |
.replace(/\r/g, '\\r') | |
.replace(/'/g, "\\'") + "'"; | |
} else { | |
return x; | |
} | |
} | |
for (let a of data){ | |
// console.group('Test', a, typeof a); | |
console.groupCollapsed('Test', repr(a), typeof a); | |
for (let b of data){ | |
if (b!==a){ | |
console.log(typeof b,repr(b),'==',repr(a),b==a) | |
} | |
} | |
console.groupEnd(); | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Интересные вещи получаются:
[42]=='\t42' // true
'\t42'==new Number(42)// true
new Number('\t42')==42//true
42==['\42']//true
q=['\t42'];
console.log(++q);//43
q=['\t42',0];
console.log(++q);//NaN