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let

Declares a variable with block level scope

Spec https://www.ecma-international.org/ecma-262/6.0/#sec-let-and-const-declarations
Status Other
IE Edge Firefox Chrome Safari Opera
      73    
    65 72    
    64 71 TP  
11 (5) 18 63 70 12 56
10 17 62 69 11.1 55
9 16 61 68 11 54
8 15 60 67 10.1 (4) 53
Show all
7 14 59 66 10 (4) 52
6 13 58 65 9.1 51
5.5 12 57 64 9 50
    56 63 8 49
    55 62 7.1 48
    54 61 7 47
    53 60 6.1 46
    52 59 6 45
    51 58 5.1 44
    50 57 5 43
    49 56 4 42
    48 55 3.2 41
    47 54 3.1 40
    46 53   39
    45 52   38
    44 51   37
    43 (1) 50   36
    42 (1) 49   35 (3)
    41 (1) 48 (3)   34 (3)
    40 (1) 47 (3)   33 (3)
    39 (1) 46 (3)   32 (3)
    38 (1) 45 (3)   31 (3)
    37 (1) 44 (3)   30 (3)
    36 (1) 43 (3)   29 (3)
    35 (1) 42 (3)   28 (3)
    34 (1) 41 (3)   27 (2)
    33 (1) 40 (2)   26 (2)
    32 (1) 39 (2)   25 (2)
    31 (1) 38 (2)   24 (2)
    30 (1) 37 (2)   23 (2)
    29 (1) 36 (2)   22 (2)
    28 (1) 35 (2)   21 (2)
    27 (1) 34 (2)   20 (2)
    26 (1) 33 (2)   19 (2)
    25 (1) 32 (2)   18 (2)
    24 (1) 31 (2)   17 (2)
    23 (1) 30 (2)   16 (2)
    22 (1) 29 (2)   15 (2)
    21 (1) 28 (2)   12.1
    20 (1) 27 (2)   12
    19 (1) 26 (2)   11.6
    18 (1) 25 (2)   11.5
    17 (1) 24 (2)   11.1
    16 (1) 23 (2)   11
    15 (1) 22 (2)   10.6
    14 (1) 21 (2)   10.5
    13 (1) 20 (2)   10.0-10.1
    12 (1) 19 (2)   9.5-9.6
    11 (1) 18   9
    10 (1) 17    
    9 (1) 16    
    8 (1) 15    
    7 (1) 14    
    6 (1) 13    
    5 (1) 12    
    4 (1) 11    
    3.6 (1) 10    
    3.5 (1) 9    
    3 (1) 8    
    2 (1) 7    
      6    
      5    
      4    
iOS Safari Opera Mini Android Browser Blackberry Browser Opera Mobile Android Chrome Android Firefox IE Mobile Android UC Browser Samsung Internet QQ Browser Baidu Browser
12 all 67 10 46 70 63 11 11.8 7.2 1.2 7.12 (3)
11.3-11.4   4.4.3-4.4.4 7 12.1     10   6.2    
11.0-11.2   4.4   12         5    
10.3 (4)   4.2-4.3   11.5         4 (3)    
Show all
10.0-10.2 (4)   4.1   11.1              
9.3   4   11              
9.0-9.2   3   10              
8.1-8.4   2.3                  
8   2.2                  
7.0-7.1   2.1                  
6.0-6.1                      
5.0-5.1                      
4.2-4.3                      
4.0-4.1                      
3.2                      

Notes

  1. Supports a non-standard version that can only be used in script elements with a type attribute of application/javascript;version=1.7. As other browsers do not support these types of script tags this makes support useless for cross-browser support.

  2. Requires the ‘Experimental JavaScript features’ flag to be enabled

  3. Only supported in strict mode

  4. let bindings in for loops are incorrectly treated as function-scoped instead of block scoped.

  5. let variables are not bound separately to each iteration of for loops

Resources

Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
http://caniuse.com/#feat=let