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noStringCaseMismatch

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Diagnostic Category: lint/correctness/noStringCaseMismatch

Since: v1.0.0

Sources:

Disallow comparison of expressions modifying the string case with non-compliant value.

if (s.toUpperCase() === "Abc") {}
code-block.js:1:5 lint/correctness/noStringCaseMismatch  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

This expression always returns false.

> 1 │ if (s.toUpperCase() === “Abc”) {}
^^^^^^^^^^^^^^^^^^^^^^^^^
2 │

This call convert the string to upper case

> 1 │ if (s.toUpperCase() === “Abc”) {}
^^^^^^^^^^^^^^^
2 │

… but this value is not in upper case

> 1 │ if (s.toUpperCase() === “Abc”) {}
^^^^^
2 │

Unsafe fix: Use upper case string value.

1 - if·(s.toUpperCase()·===·Abc)·{}
1+ if·(s.toUpperCase()·===·ABC)·{}
2 2

while (s.toLowerCase() === "Abc") {}
code-block.js:1:8 lint/correctness/noStringCaseMismatch  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

This expression always returns false.

> 1 │ while (s.toLowerCase() === “Abc”) {}
^^^^^^^^^^^^^^^^^^^^^^^^^
2 │

This call convert the string to lower case

> 1 │ while (s.toLowerCase() === “Abc”) {}
^^^^^^^^^^^^^^^
2 │

… but this value is not in lower case

> 1 │ while (s.toLowerCase() === “Abc”) {}
^^^^^
2 │

Unsafe fix: Use lower case string value.

1 - while·(s.toLowerCase()·===·Abc)·{}
1+ while·(s.toLowerCase()·===·abc)·{}
2 2

if (s.toUpperCase() === "ABC") {}
while (s.toLowerCase() === "abc") {}
for (;s.toLocaleLowerCase() === "ABC";) {}
while (s.toLocaleUpperCase() === "abc") {}
for (let s = "abc"; s === "abc"; s = s.toUpperCase()) {}