The snippet library.
Small, practical examples. Search by task or narrow things down below.
Split an array into bounded batches
JavaScript: Advance by a positive batch size and allow a shorter final chunk.
JavaScript✓ Tested
Split and trim text
Split simple comma-separated JavaScript text and trim each part.
JavaScript✓ Tested
Split text on several separator characters
JavaScript: A regex character class can recognize alternative simple delimiters.
JavaScript✓ Tested
Store a value in a named variable
JavaScript: Give a value a descriptive name and print it.
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Sum numeric values
Provide an initial accumulator for JavaScript reduce, including empty arrays.
JavaScript✓ Tested
Transform a resolved promise result
JavaScript: A then handler returns the value passed to the next promise in the chain.
JavaScript✓ Tested
Transform array values
Use map to create a JavaScript array of squared values.
JavaScript✓ Tested
Transform each regex match with a callback
JavaScript: A replacement callback computes the replacement separately for each match.
JavaScript✓ Tested
Trim and discard blank lines
JavaScript: Split a text block, trim each line, and keep nonempty values.
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Trim surrounding whitespace
Remove leading and trailing JavaScript string whitespace.
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Update a running count
JavaScript: Change a variable after its initial value has been assigned.
JavaScript✓ Tested
Use the first fulfilled promise result
JavaScript: Promise.any ignores individual rejections until one input fulfills.
JavaScript✓ Tested