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Go
sync/atomic — Lock-Free Counter
For simple counters and flags, atomic ops are much faster than `sync.Mutex`. Go 1.19+ added typed wrappers (`atomic.Int64`) — clearer than the raw functions.
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PHP
Atomic Counter with flock
A single-file counter that survives concurrent increments correctly using flock + read-modify-write inside the locked region. Useful for crude visitor or job-id counters when you don't want a DB.
JavaScript
Animate Counter (Number Roll-Up)
Smoothly animates a number from a start value to an end value over a given duration using requestAnimationFrame. Supports a custom easing function (defaults to ease-out quad). Ideal for dashboard stat widgets, donation counters, and any UI where a bare static number would be less impactful.