This JavaScript exception applying the ‘delete’ operator to an unqualified name is deprecated works in strict mode and it occurs if variables are tried to be deleted with the delete operator.
Message:
SyntaxError: Calling delete on expression not allowed
in strict mode (Edge)
SyntaxError: applying the 'delete' operator to an unqualified name
is deprecated (Firefox)
SyntaxError: Delete of an unqualified identifier in strict mode.
(Chrome)
Error Type:
SyntaxError
Cause of Error: In strict mode, trying to delete a variable will throw an error and is not permitted. Normal variables in JavaScript can’t be deleted with the help of the delete operator.
Example 1:
Javascript
'use strict';let GFG = "This is neveropen";console.log(GFG);GFG = null; |
Output:
This is neveropen
Example 2: In this example, the delete operator is used which causes the error.
Javascript
'use strict';let GFG = "This is GeeksForGeeks";console.log(GFG);delete GFG; |
Output(in console):
SyntaxError: Delete of an unqualified identifier in strict mode.
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