ECMAScript’s "upsert" proposal recently reached stage 4, and introduces 2 new methods on Map and WeakMap:
Microsoft Office
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The past three years have been the warmest on record. The chart compiled by the European Union’s Copernicus Climate Change Service shows the comparison to preindustrial-era temperatures in the second half of the 1800s. C3S/ECMWF，详情可参考PDF资料