Logical AND assignment // Equivalent to: a & (a = b) // Only assigns if a is truthy Logical OR assignment // Equivalent to: a || (a = b) // Only assigns if a is falsy falsy: false, 0, -0, 0n, "", null, undefined, and NaN // truthy: all values are truthy unless defined as falsy // nullish: null or undefined It works for numeric literals (integer, bigint, floating-point), fractional, and exponent parts with following limitations: They are meant exclusively as a visual clue to aid development and have no runtime semantics. This feature is designed to have no impact on the interpretation semantics of numeric literals: _ are to be ignored by interpreters and should have no effect. This is a new stage-4 proposal JavaScript language feature enables underscores ( _, U+005F) as separators in numeric literals to improve readability.
Large numeric literals are difficult for the human eye to parse quickly, especially when there are long digit repetitions. People often talk about JavaScript features but refer to ECMAScript specification. ECMAScript was always an unwanted name that makes everything confusing to beginners. Note: ECMAScript is the standard upon which JavaScript is based, managed by TC39 committee. Weak References ( WeakRef and FinalizationRegistry).You can already start using in latest versions of browsers, Node.js, and Babel. At the time of writing, following new JavaScript proposal features has made to stage-4 and will almost certainly be included in ES2021.
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