The operator “+” is used to add values and/or variables. For an example let p=25, so q=p+5 will gives us a result q=30. The operator “-” is used to subtract. For an example let p=25, so q=p-5 will gives us a result q=20. The operator “*” is used to multiply. For an example let p=25, so q=p*5 will gives us a result q=125. The operator “/” is used to divide. For an example let p=25, so q=p/5 will gives us a result q=5. Modulus (division remainder) operator is “%”. For an example let p=25, so q=p%4 will gives us a result q=1. The Increment operator is “++”.For an example let p=25, so q=++p will gives us a result q=26. . The decrement operator is “--”.For an example let p=25, so q=--p will gives us a result q=24.
The operator “=” is used to show that tow value are equal. For an example let p=50, so q=p will gives us a result q=50. Other important JavaScript Assignment Operators are “+=”, “-=”, “*=”, “/=” and “%=”. If p=25 and q=10, p+=q will gives us a result p=35 (it is similar to p=p+q). If p=25 and q=10, p-=q will gives us a result p=15 (it is similar to p=p-q). If p=25 and q=10, p*=q will gives us a result p=250 (it is similar to p=p*q). If p=25 and q=10, p/=q will gives us a result p=2.5 (it is similar to p=p/q) and if p=25 and q=10, p%=q will gives us a result p=5 (it is similar to p=p%q).
The “is equal to” operator is “==”. For an example, let p=15, so p==20 is false. The “is exactly equal to (value and type)” operator is “===”. For an example, let p=15, so p=== “15” is false but p===15 is true. The “is not equal” operator is “!=”. For an example, let p=15, so p!=20 is true. The “is greater than” operator is “>”. For an example, let p=15, so p>20 is false. The “is less than” operator is “<”. For an example, let p=15, so p<20 is true. The “is greater than or equal to” operator is “>=”. For an example, let p=15, so p>=20 is false. The “is less than or equal to” operator is “<=”. For an example, let p=15, so p<=20 is true.
The “&&” operator is used to describe and, “||” operator for or and “!” operator for not. For example let p=20 and q=10, so
(p < 30 && q > 5) is true, (p==15 || q==15) is false and !(p==q) is true.
JavaScript also contains a conditional operator. This conditional operator assigns a value to a variable based on some condition. Let we want to compare a value of a variable to a pre-defined value, and if it returns true it will gives an output and if not it will returns other output. The syntax is
variable_name=(condition)?value1:value2
Let the variable name is permission; we want that only 18+ age are welcomed here others are not. So, the condition will be age>=18 and value1 will be (incase of true) “Welcome” and value2 will be (incase of false) “You are too young”. So, total code will be
CODE
permission=(age>=18)? “Welcome”: “You are too young”;
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