(<<)

Baseline

20157

(<<) 1 0

const a = 5; // 00000000000000000000000000000101
const b = 2; // 00000000000000000000000000000010

console.log(a << b); // 00000000000000000000000000010100
// : 20

x << y

<< 2 32 32 TypeError

2 9 << 2 36

     9 (10 ): 00000000000000000000000000001001 (2 )
                  --------------------------------
9 << 2 (10 ): 00000000000000000000000000100100 (2 ) = 36 (10 )

x y x * 2 ** y 9 << 3 9 * (2 ** 3) = 9 * (8) = 72

32 32 32

Before: 11100110111110100000000000000110000000000001
After:              10100000000000000110000000000001

32 32 0 31 100 << 32 100 << 0 (100) 32 32 0

: << 0 x 0 x 32 -2147483648 2147483647 Math.trunc()

0 1

9 << 3; // 72

// 9 * (2 ** 3) = 9 * (8) = 72

9n << 3n; // 72n


ECMAScript 2027 LanguageSpecification # sec-left-shift-operator

(JavaScript )

MDN

MDN 202598

GitHub

JavaScript
JavaScript
1. (+)
2. (+=)
3. (=)
4. async function
5. async function*
6. await
7. (&)
8. (&=)
9. (~)
10. (|)
11. (|=)
12. (^)
13. (^=)
14. class
15. (,)
17. (--)
18. delete
20. (/)
21. (/=)
22. (==)
23. (**)
24. (**=)
25. function
26. function*
27. (>)
28. (>=)
29. ( )
30. import.meta
  1. import.meta.resolve()
31. import()
32. in
33. (++)
34. (!=)
35. instanceof
36. (<<)
37. (<<=)
38. (<)
39. (<=)
40. (&&)
41. (&&=)
42. (!)
43. (||)
44. (||=)
45. (*)
46. (*=)
47. new
48. new.target
49. null
50. (??=)
51. (??)
54. (?.)
56. (%)
57. (%=)
58. (>>)
59. (>>=)
60. (...)
61. (===)
62. (!==)
63. (-)
64. (-=)
65. super
66. this
67. typeof
68. (-)
69. (+)
70. (>>>)
71. (>>>=)
72. void
73. yield
74. yield*