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JSON.parse(): valid syntax does not mean correct schema
After reading, the expected structure should be checked.
Published22 Oct 2026
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JSON.stringify(): which values are not retained as expected
JSON does not represent any JavaScript type without conversion.
Published22 Oct 2026
Technology
getTime(): milliseconds since the epoch
The unit is important in exchanging with systems that use seconds.
Published22 Oct 2026
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toISOString(): moment is recorded in UTC
The letter Z at the end denotes zero offset.
Published22 Oct 2026
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RegExp.test(): why rechecking may be different
Expressions with g or y keep a position on the last match.
Published22 Oct 2026
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matchAll(): all matches with their groups
The result is an iterator that can be traversed.
Published22 Oct 2026
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toLowerCase(): normalized key without loss of original
The method returns a new string in lowercase letters.
Published22 Oct 2026
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substring(): the final position remains outside the snippet
Interchanged boundaries have a specific behavior.
Published22 Oct 2026
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repeat(): repetition of text with a controlled number
The output string remains unchanged.
Published22 Oct 2026
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copyWithin(): moving values inside the array
The method copies in place and does not increase the length.
Published22 Oct 2026
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fill(): same value can mean one shared object
Filling an array does not create an independent copy for each position.
Published22 Oct 2026
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concat(): pooled list without changing sources
Deep nested arrays do not unfold automatically.
Published22 Oct 2026