String Manipulation Functions:
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1) charAt()
2) charCodeAt()
3) slice()
4) substr()
5) substring()
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indexOf()
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==> indexOf() can accept a character and return the index of the specified character.
Syntax:
str-object.indexOf(character)
==> if the specified character is duplicated (char at multiple places within the string):
indexOf() can return the index of the first occurrence.
==> if the specified character is not present:
indexOf() can return '-1'
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lastIndexOf():
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==> lastIndexOf() can accept a character and return the index of the specified character.
Syntax:
str.lastIndexOf(character)
==> if the specified character is duplicated:
lastIndexOf() can return:
character's the last occurrence index
==> if the specified character is not present:
it can return -1.
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