const

Declares a constant with block level scope

Spec	https://tc39.es/ecma262/#sec-let-and-const-declarations
Status	Other

IE	Edge	Firefox	Chrome	Safari	Opera
			98
		95	97
		94	96	TP
11 ⁽⁵⁾	95	93	95	15	80
10	94	92	94	14.1	79
9	93	91	93	14	78
8	92	90	92	13.1	77
Show all
7	91	89	91	13	76
6	90	88	90	12.1	75
5.5	89	87	89	12	74
	88	86	88	11.1	73
	87	85	87	11	72
	86	84	86	10.1 ⁽²⁾	71
	85	83	85	10 ⁽²⁾	70
	84	82	84	9.1 ^(2,3)	69
	83	81	83	9 ^(2,3)	68
	81	80	81	8 ^(2,3)	67
	80	79	80	7.1 ^(2,3)	66
	79	78	79	7 ^(2,3)	65
	18	77	78	6.1 ^(2,3)	64
	17	76	77	6 ^(2,3)	63
	16	75	76	5.1 ^(2,3)	62
	15	74	75	5 ⁽²⁾	60
	14	73	74	4 ⁽²⁾	58
	13	72	73	3.2 ⁽²⁾	57
	12	71	72	3.1 ⁽²⁾	56
		70	71		55
		69	70		54
		68	69		53
		67	68		52
		66	67		51
		65	66		50
		64	65		49
		63	64		48
		62	63		47
		61	62		46
		60	61		45
		59	60		44
		58	59		43
		57	58		42
		56	57		41
		55	56		40
		54	55		39
		53	54		38
		52	53		37
		51	52		36
		50	51		35 ⁽⁴⁾
		49	50		34 ⁽⁴⁾
		48	49		33 ⁽⁴⁾
		47	48 ⁽⁴⁾		32 ⁽⁴⁾
		46	47 ⁽⁴⁾		31 ⁽⁴⁾
		45	46 ⁽⁴⁾		30 ⁽⁴⁾
		44	45 ⁽⁴⁾		29 ⁽⁴⁾
		43	44 ⁽⁴⁾		28 ⁽⁴⁾
		42	43 ⁽⁴⁾		27 ^(2,3)
		41	42 ⁽⁴⁾		26 ^(2,3)
		40	41 ⁽⁴⁾		25 ^(2,3)
		39	40 ^(2,3)		24 ^(2,3)
		38	39 ^(2,3)		23 ^(2,3)
		37	38 ^(2,3)		22 ^(2,3)
		36	37 ^(2,3)		21 ^(2,3)
		35 ⁽²⁾	36 ^(2,3)		20 ^(2,3)
		34 ⁽²⁾	35 ^(2,3)		19 ^(2,3)
		33 ⁽²⁾	34 ^(2,3)		18 ^(2,3)
		32 ⁽²⁾	33 ^(2,3)		17 ^(2,3)
		31 ⁽²⁾	32 ^(2,3)		16 ^(2,3)
		30 ⁽²⁾	31 ^(2,3)		15 ^(2,3)
		29 ⁽²⁾	30 ^(2,3)		12.1 ^(1,3)
		28 ⁽²⁾	29 ^(2,3)		12 ^(1,3)
		27 ⁽²⁾	28 ^(2,3)		11.6 ^(1,3)
		26 ⁽²⁾	27 ^(2,3)		11.5 ⁽¹⁾
		25 ⁽²⁾	26 ^(2,3)		11.1 ⁽¹⁾
		24 ⁽²⁾	25 ^(2,3)		11 ⁽¹⁾
		23 ⁽²⁾	24 ^(2,3)		10.6 ⁽¹⁾
		22 ⁽²⁾	23 ^(2,3)		10.5 ⁽¹⁾
		21 ⁽²⁾	22 ^(2,3)		10.0-10.1 ⁽¹⁾
		20 ⁽²⁾	21 ^(2,3)		9.5-9.6
		19 ⁽²⁾	20 ⁽²⁾		9
		18 ⁽²⁾	19 ⁽²⁾
		17 ⁽²⁾	18 ⁽²⁾
		16 ⁽²⁾	17 ⁽²⁾
		15 ⁽²⁾	16 ⁽²⁾
		14 ⁽²⁾	15 ⁽²⁾
		13 ⁽²⁾	14 ⁽²⁾
		12 ⁽¹⁾	13 ⁽²⁾
		11 ⁽¹⁾	12 ⁽²⁾
		10 ⁽¹⁾	11 ⁽²⁾
		9 ⁽¹⁾	10 ⁽²⁾
		8 ⁽¹⁾	9 ⁽²⁾
		7 ⁽¹⁾	8 ⁽²⁾
		6 ⁽¹⁾	7 ⁽²⁾
		5 ⁽¹⁾	6 ⁽²⁾
		4 ⁽¹⁾	5 ⁽²⁾
		3.6 ⁽¹⁾	4 ⁽²⁾
		3.5 ⁽¹⁾
		3 ⁽¹⁾
		2 ⁽¹⁾

Safari on iOS	Opera Mini	Android Browser	Blackberry Browser	Opera Mobile	Android Chrome	Android Firefox	IE Mobile	Android UC Browser	Samsung Internet	QQ Browser	Baidu Browser	KaiOS Browser
15	all ^(1,3)	94	10 ^(2,3)	64	94	92	11	12.12	15.0	10.4	7.12 ⁽⁴⁾	2.5
14.5-14.8		4.4.3-4.4.4 ^(2,3)	7 ^(2,3)	12.1 ^(1,3)			10		14.0
14.0-14.4		4.4 ^(2,3)		12 ^(1,3)					13.0
13.4-13.7		4.2-4.3 ^(2,3)		11.5 ⁽¹⁾					12.0
Show all
13.3		4.1 ^(2,3)		11.1 ⁽¹⁾					11.1-11.2
13.2		4 ^(2,3)		11 ⁽¹⁾					10.1
13.0-13.1		3 ^(2,3)		10 ⁽¹⁾					9.2
12.2-12.5		2.3 ⁽²⁾							8.2
12.0-12.1		2.2							7.2-7.4
11.3-11.4		2.1							6.2-6.4
11.0-11.2									5.0-5.4
10.3 ⁽²⁾									4 ⁽⁴⁾
10.0-10.2 ⁽²⁾
9.3 ^(2,3)
9.0-9.2 ^(2,3)
8.1-8.4 ^(2,3)
8 ^(2,3)
7.0-7.1 ^(2,3)
6.0-6.1 ^(2,3)
5.0-5.1 ^(2,3)
4.2-4.3 ⁽²⁾
4.0-4.1 ⁽²⁾
3.2 ⁽²⁾

Notes

const is recognized, but treated like var (no block scope, can be overwritten)
const does not have block scope
Only recognized when NOT in strict mode
Supported correctly in strict mode, otherwise supported without block scope
Not supported in for-in and for-of loops

Resources

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Licensed under the Creative Commons Attribution License v4.0.
https://caniuse.com/const