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Because when let is used to create a variable within a block scope ({ ... }), the variable is only available in it. This type of variables are called local variables; while when var is used to create a variable within a block scope ({ ... }), the variable is available everywhere in the program (within or outside the scope). This type of variables are called global variables
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Hi, i don't understand why hello variable is not defined.
We know it has been declared like greeting variable.
Because when
letis used to create a variable within a block scope ({ ... }), the variable is only available in it. This type of variables are called local variables; while whenvaris used to create a variable within a block scope ({ ... }), the variable is available everywhere in the program (within or outside the scope). This type of variables are called global variables