How WebAssembly Quietly Solved 7 Problems JavaScript Could Not

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WebAssembly (Wasm) has emerged as a practical solution to longstanding limitations of JavaScript, which has been the browser's dominant language for roughly 25 years. JavaScript struggles with heavy computation, sandboxed execution of untrusted code, and sharing logic across multiple environments — problems that previously forced developers toward native apps or costly backend workarounds. Wasm addresses these by running near-native speed code compiled from languages like Rust or C++, within a strict sandbox that limits access to only explicitly granted resources. Real-world adopters include Google Sheets, which doubled its recalculation speed using Wasm, Figma, whose design engine runs entirely on it, and Shopify and Cloudflare, which use Wasm to safely execute untrusted merchant and customer code at the network edge. Wasm's growing adoption is driven not by novelty but by its ability to solve specific, expensive engineering problems that had no adequate solution in JavaScript alone.

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