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Concept visual
Start from A
Removes whitespace from the start of a string
Removes whitespace from the end of a string Object.fromEntries
Allows to omit the catch parameter if it is not needed
Creates a new array by flattening a nested array
Maps all array elements and creates a new array by flattening the array
Browsers must now use a stable sorting algorithm Revised JSON.stringify()
Formula
Strings with UTF - 8 code points now convert safelyLine and paragraph separators (\u2028 and \u2029) are now allowed in strings Revised Function.toString() Now returns source code including comments and spaces and syntax details
ECMAScript 2019 is supported in all modern browsers since
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