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
			103
		100	102
		99	101	TP
11 ⁽⁵⁾	99	98	100	15.4	83
10	98	97	99	15.2-15.3	82
9	97	96	98	15.1	81
8	96	95	97	15	80
Show all
7	95	94	96	14.1	79
6	94	93	95	14	78
5.5	93	92	94	13.1	77
	92	91	93	13	76
	91	90	92	12.1	75
	90	89	91	12	74
	89	88	90	11.1	73
	88	87	89	11	72
	87	86	88	10.1 ⁽²⁾	71
	86	85	87	10 ⁽²⁾	70
	85	84	86	9.1 ^(2,3)	69
	84	83	85	9 ^(2,3)	68
	83	82	84	8 ^(2,3)	67
	81	81	83	7.1 ^(2,3)	66
	80	80	81	7 ^(2,3)	65
	79	79	80	6.1 ^(2,3)	64
	18	78	79	6 ^(2,3)	63
	17	77	78	5.1 ^(2,3)	62
	16	76	77	5 ⁽²⁾	60
	15	75	76	4 ⁽²⁾	58
	14	74	75	3.2 ⁽²⁾	57
	13	73	74	3.1 ⁽²⁾	56
	12	72	73		55
		71	72		54
		70	71		53
		69	70		52
		68	69		51
		67	68		50
		66	67		49
		65	66		48
		64	65		47
		63	64		46
		62	63		45
		61	62		44
		60	61		43
		59	60		42
		58	59		41
		57	58		40
		56	57		39
		55	56		38
		54	55		37
		53	54		36
		52	53		35 ⁽⁴⁾
		51	52		34 ⁽⁴⁾
		50	51		33 ⁽⁴⁾
		49	50		32 ⁽⁴⁾
		48	49		31 ⁽⁴⁾
		47	48 ⁽⁴⁾		30 ⁽⁴⁾
		46	47 ⁽⁴⁾		29 ⁽⁴⁾
		45	46 ⁽⁴⁾		28 ⁽⁴⁾
		44	45 ⁽⁴⁾		27 ^(2,3)
		43	44 ⁽⁴⁾		26 ^(2,3)
		42	43 ⁽⁴⁾		25 ^(2,3)
		41	42 ⁽⁴⁾		24 ^(2,3)
		40	41 ⁽⁴⁾		23 ^(2,3)
		39	40 ^(2,3)		22 ^(2,3)
		38	39 ^(2,3)		21 ^(2,3)
		37	38 ^(2,3)		20 ^(2,3)
		36	37 ^(2,3)		19 ^(2,3)
		35 ⁽²⁾	36 ^(2,3)		18 ^(2,3)
		34 ⁽²⁾	35 ^(2,3)		17 ^(2,3)
		33 ⁽²⁾	34 ^(2,3)		16 ^(2,3)
		32 ⁽²⁾	33 ^(2,3)		15 ^(2,3)
		31 ⁽²⁾	32 ^(2,3)		12.1 ^(1,3)
		30 ⁽²⁾	31 ^(2,3)		12 ^(1,3)
		29 ⁽²⁾	30 ^(2,3)		11.6 ^(1,3)
		28 ⁽²⁾	29 ^(2,3)		11.5 ⁽¹⁾
		27 ⁽²⁾	28 ^(2,3)		11.1 ⁽¹⁾
		26 ⁽²⁾	27 ^(2,3)		11 ⁽¹⁾
		25 ⁽²⁾	26 ^(2,3)		10.6 ⁽¹⁾
		24 ⁽²⁾	25 ^(2,3)		10.5 ⁽¹⁾
		23 ⁽²⁾	24 ^(2,3)		10.0-10.1 ⁽¹⁾
		22 ⁽²⁾	23 ^(2,3)		9.5-9.6
		21 ⁽²⁾	22 ^(2,3)		9
		20 ⁽²⁾	21 ^(2,3)
		19 ⁽²⁾	20 ⁽²⁾
		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
15.4	all ^(1,3)	99	10 ^(2,3)	64	100	98	11	12.12	16.0	10.4	7.12 ⁽⁴⁾	2.5
15.2-15.3		4.4.3-4.4.4 ^(2,3)	7 ^(2,3)	12.1 ^(1,3)			10		15.0
15.0-15.1		4.4 ^(2,3)		12 ^(1,3)					14.0
14.5-14.8		4.2-4.3 ^(2,3)		11.5 ⁽¹⁾					13.0
Show all
14.0-14.4		4.1 ^(2,3)		11.1 ⁽¹⁾					12.0
13.4-13.7		4 ^(2,3)		11 ⁽¹⁾					11.1-11.2
13.3		3 ^(2,3)		10 ⁽¹⁾					10.1
13.2		2.3 ⁽²⁾							9.2
13.0-13.1		2.2							8.2
12.2-12.5		2.1							7.2-7.4
12.0-12.1									6.2-6.4
11.3-11.4									5.0-5.4
11.0-11.2									4 ⁽⁴⁾
10.3 ⁽²⁾
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

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

Name	Support Tables
Version
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Last Updated	2022-04-11T17:49:08Z