ES2015 Extended Literals

[kphillisjr]

This is not a lot of features, but this is general features revolving around strings. (This and more examples can be found at: http://es6-features.org/ )

• [ ] Unicode String & RegExp Literal

  // New Code:
  "𠮷".length === 2;
  "𠮷".match(/./u)[0].length === 2;
  "\u{20BB7}" === "𠮷" === "\uD842\uDFB7";
  "𠮷".codePointAt(0) == 0x20BB7;
  for (let codepoint of "𠮷") console.log(codepoint);
  
  // Old Code
  "𠮷".length === 2;
  "𠮷".match(/(?:[\0-\t\x0B\f\x0E-\u2027\u202A-\uD7FF\uE000-\uFFFF][\uD800-\uDBFF][\uDC00-\uDFFF][\uD800-\uDBFF](?![\uDC00-\uDFFF])(?:[^\uD800-\uDBFF]^)[\uDC00-\uDFFF])/)[0].length === 2;
  "𠮷" === "\uD842\uDFB7";
  //  no equivalent in ES5
  //  no equivalent in ES5

• [x] Binary and Octal Literals. => Implemented by #1057

  // New Code:
  0b111110111 === 503;
  0o767 === 503;
  
  // old Code:
  parseInt("111110111", 2) === 503;
  parseInt("767", 8) === 503;
  0767 === 503; // only in non-strict, backward compatibility mode

[svaarala]

Regarding Unicode literals, the following work in master:

duk> "𠮷".length
= 2
duk> "\u{20BB7}" === "𠮷"
= true
duk> "𠮷" === "\uD842\uDFB7"
= true
duk> "𠮷".codePointAt(0) == 0x20BB7;
= true

What doesn't yet work is:

// No RegExp /u mode yet
"𠮷".match(/./u)[0].length === 2;

// No for-of iteration yet
for (let codepoint of "𠮷") console.log(codepoint);