To check if a number is not greater than 0 , use the logical NOT (!) operator to negate the condition, e.g. !( num > 0) . If the number is not greater than 0 , the condition will return true , otherwise false will be returned.
What is != In JS?
The inequality operator ( != ) checks whether its two operands are not equal, returning a Boolean result. Unlike the strict inequality operator, it attempts to convert and compare operands that are of different types.
The comparison operators take simple values (numbers or string) as arguments and evaluate either true or false….Comparison Operators.
|Less than or equal (<=)||x<=y||Returns true if the left operand is less than or equal to the right operand.|
The greater than or equal operator ( >= ) returns true if the left operand is greater than or equal to the right operand, and false otherwise.
The logical NOT ( ! ) operator (logical complement, negation) takes truth to falsity and vice versa. It is typically used with boolean (logical) values. When used with non-Boolean values, it returns false if its single operand can be converted to true ; otherwise, returns true .
A variable with no value simply means it is undefined. ‘a’ doesn’t contain any value, the data type is undefined. var b=null; The data type of a variable which doesn’t contain a value is ‘undefined’, but the data type of a variable which contains a ‘null’ value is ‘object’ instead of ‘null’.
The greater than operator ( > ) returns true if the left operand is greater than the right operand, and false otherwise.
When comparing two strings, “2” will be greater than “12”, because (alphabetically) 1 is less than 2. To secure a proper result, variables should be converted to the proper type before comparison: