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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
			108
		107	107	TP
		106	106	16.1
11 ⁽⁵⁾	105	105	105	16.0	91
10	104	104	104	15.6	90
9	103	103	103	15.5	89
8	102	102	102	15.4	88
Show all
7	101	101	101	15.2-15.3	87
6	100	100	100	15.1	86
5.5	99	99	99	15	85
	98	98	98	14.1	84
	97	97	97	14	83
	96	96	96	13.1	82
	95	95	95	13	81
	94	94	94	12.1	80
	93	93	93	12	79
	92	92	92	11.1	78
	91	91	91	11	77
	90	90	90	10.1 ⁽²⁾	76
	89	89	89	10 ⁽²⁾	75
	88	88	88	9.1 ^(2,3)	74
	87	87	87	9 ^(2,3)	73
	86	86	86	8 ^(2,3)	72
	85	85	85	7.1 ^(2,3)	71
	84	84	84	7 ^(2,3)	70
	83	83	83	6.1 ^(2,3)	69
	81	82	81	6 ^(2,3)	68
	80	81	80	5.1 ^(2,3)	67
	79	80	79	5 ⁽²⁾	66
	18	79	78	4 ⁽²⁾	65
	17	78	77	3.2 ⁽²⁾	64
	16	77	76	3.1 ⁽²⁾	63
	15	76	75		62
	14	75	74		60
	13	74	73		58
	12	73	72		57
		72	71		56
		71	70		55
		70	69		54
		69	68		53
		68	67		52
		67	66		51
		66	65		50
		65	64		49
		64	63		48
		63	62		47
		62	61		46
		61	60		45
		60	59		44
		59	58		43
		58	57		42
		57	56		41
		56	55		40
		55	54		39
		54	53		38
		53	52		37
		52	51		36
		51	50		35 ⁽⁴⁾
		50	49		34 ⁽⁴⁾
		49	48 ⁽⁴⁾		33 ⁽⁴⁾
		48	47 ⁽⁴⁾		32 ⁽⁴⁾
		47	46 ⁽⁴⁾		31 ⁽⁴⁾
		46	45 ⁽⁴⁾		30 ⁽⁴⁾
		45	44 ⁽⁴⁾		29 ⁽⁴⁾
		44	43 ⁽⁴⁾		28 ⁽⁴⁾
		43	42 ⁽⁴⁾		27 ^(2,3)
		42	41 ⁽⁴⁾		26 ^(2,3)
		41	40 ^(2,3)		25 ^(2,3)
		40	39 ^(2,3)		24 ^(2,3)
		39	38 ^(2,3)		23 ^(2,3)
		38	37 ^(2,3)		22 ^(2,3)
		37	36 ^(2,3)		21 ^(2,3)
		36	35 ^(2,3)		20 ^(2,3)
		35 ⁽²⁾	34 ^(2,3)		19 ^(2,3)
		34 ⁽²⁾	33 ^(2,3)		18 ^(2,3)
		33 ⁽²⁾	32 ^(2,3)		17 ^(2,3)
		32 ⁽²⁾	31 ^(2,3)		16 ^(2,3)
		31 ⁽²⁾	30 ^(2,3)		15 ^(2,3)
		30 ⁽²⁾	29 ^(2,3)		12.1 ^(1,3)
		29 ⁽²⁾	28 ^(2,3)		12 ^(1,3)
		28 ⁽²⁾	27 ^(2,3)		11.6 ^(1,3)
		27 ⁽²⁾	26 ^(2,3)		11.5 ⁽¹⁾
		26 ⁽²⁾	25 ^(2,3)		11.1 ⁽¹⁾
		25 ⁽²⁾	24 ^(2,3)		11 ⁽¹⁾
		24 ⁽²⁾	23 ^(2,3)		10.6 ⁽¹⁾
		23 ⁽²⁾	22 ^(2,3)		10.5 ⁽¹⁾
		22 ⁽²⁾	21 ^(2,3)		10.0-10.1 ⁽¹⁾
		21 ⁽²⁾	20 ⁽²⁾		9.5-9.6
		20 ⁽²⁾	19 ⁽²⁾		9
		19 ⁽²⁾	18 ⁽²⁾
		18 ⁽²⁾	17 ⁽²⁾
		17 ⁽²⁾	16 ⁽²⁾
		16 ⁽²⁾	15 ⁽²⁾
		15 ⁽²⁾	14 ⁽²⁾
		14 ⁽²⁾	13 ⁽²⁾
		13 ⁽²⁾	12 ⁽²⁾
		12 ⁽¹⁾	11 ⁽²⁾
		11 ⁽¹⁾	10 ⁽²⁾
		10 ⁽¹⁾	9 ⁽²⁾
		9 ⁽¹⁾	8 ⁽²⁾
		8 ⁽¹⁾	7 ⁽²⁾
		7 ⁽¹⁾	6 ⁽²⁾
		6 ⁽¹⁾	5 ⁽²⁾
		5 ⁽¹⁾	4 ⁽²⁾
		4 ⁽¹⁾
		3.6 ⁽¹⁾
		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
16.1
16.0	all ^(1,3)	105	10 ^(2,3)	64	105	104	11	13.4	18.0	13.1	13.18	2.5
15.6		4.4.3-4.4.4 ^(2,3)	7 ^(2,3)	12.1 ^(1,3)			10		17.0
15.5		4.4 ^(2,3)		12 ^(1,3)					16.0
15.4		4.2-4.3 ^(2,3)		11.5 ⁽¹⁾					15.0
Show all
15.2-15.3		4.1 ^(2,3)		11.1 ⁽¹⁾					14.0
15.0-15.1		4 ^(2,3)		11 ⁽¹⁾					13.0
14.5-14.8		3 ^(2,3)		10 ⁽¹⁾					12.0
14.0-14.4		2.3 ⁽²⁾							11.1-11.2
13.4-13.7		2.2							10.1
13.3		2.1							9.2
13.2									8.2
13.0-13.1									7.2-7.4
12.2-12.5									6.2-6.4
12.0-12.1									5.0-5.4
11.3-11.4									4 ⁽⁴⁾
11.0-11.2
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

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