7 New JavaScript Features in ECMAScript 2026 That Replace Everyday Workarounds

Short summary

ECMAScript 2026 introduces seven practical language-level APIs that replace common manual workarounds: Array.fromAsync(), Map.prototype.getOrInsert(), Iterator.concat(), Error.isError(), Math.sumPrecise(), native Base64/hex for Uint8Array, and JSON source text access. Each replaces patterns developers have been writing by hand for years — no framework or architectural rewrite needed. The article provides code examples and real-world use cases for each feature.

• •Array.fromAsync() simplifies collecting async iterable values into arrays
• •Map.getOrInsert() eliminates boilerplate check-then-set patterns
• •Seven new APIs replace everyday manual workarounds at the language level

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