Table of Contents

• Quick Take
• Classify individual characters
• Parse typed, short and repeatable CLI flags
• Assemble CLI help text
• Deeply clone a cyclic object graph
• Detect and resolve line endings
• Test whether a value exists
• Find overlapping substring occurrences
• Match a string against literal and regular-expression choices
• Intersect arrays in the first array's order
• Reject a character that is not a digit
• Omit keys and clone retained values
• Check own properties safely
• Distinguish plain objects from other object values
• Remove selected array values without mutating the input
• Remove one trailing slash
• Sort strings with the shared comparator
• Replace part of a string
• Reuse shared text symbols and HTML tag sets
• Check common JavaScript value types
• Deduplicate values while preserving order
• Match wildcard allow-lists and deny-lists

Quick Take

Classify individual characters

Parse typed, short and repeatable CLI flags

Assemble CLI help text

Deeply clone a cyclic object graph

Detect and resolve line endings

Test whether a value exists

Find overlapping substring occurrences

Match a string against literal and regular-expression choices

Intersect arrays in the first array's order

Reject a character that is not a digit

Omit keys and clone retained values

Check own properties safely

Distinguish plain objects from other object values

Remove selected array values without mutating the input

Remove one trailing slash

Sort strings with the shared comparator

Replace part of a string

Reuse shared text symbols and HTML tag sets

Check common JavaScript value types

Deduplicate values while preserving order

Match wildcard allow-lists and deny-lists