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ID: javascript-best-practices/no-octal
Language: JavaScript
Severity: Error
Category: Best Practices
In JavaScript, numbers that start with a leading zero (0
) are considered octal (base-8) literals. However, octal literals can lead to unintended and unexpected behavior, especially for developers who are not familiar with this notation or when used accidentally.
var a = 01234;
a = 1 + 01234;
00;
08;
09.1;
09e1;
09.1e1;
018;
019.1;
019e1;
019.1e1;
var a = 'hello world';
0x1234
0X5;
a = 0;
0.1
0.5e1
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