If the value on the left of the || does not equal to zero, false, null undefined, or an empty string, then the value on the left will be assigned to the variable.Īlthough the value on the left can be an undefined value for JS to evaluate the condition but the variable has to be declared otherwise an exception will be produced. Method 2: In this method, if the value of the left of the || is equal to zero, false, null, undefined, or an empty string, then the value on the right will be assigned to the variable. Var b = a > 0? (a = 1? "A is 1" : "A is not 1") : (a = 0? "A is zero" : "A is negative") Nesting example of method 1: Change variable A value to 0, 1, 2 and a negative value to see how the statement would produce the result. You can also nest many conditions into one statement. But first, let’s see what happens with boolean values. In JavaScript, the operator is a little bit trickier and more powerful. If any of its arguments are true, it returns true, otherwise it returns false. If the condition evaluates to false the condition on the right will be assigned to the variable. In classical programming, the logical OR is meant to manipulate boolean values only. The operator is used in conditional statements, and when paired with a :, can function as a compact alternative to if.else statements. Use else if to specify a new condition to test, if the first condition is false. Use else to specify a block of code to be executed, if the same condition is false. Method 1: If the condition evaluates to true, the value on the left side of the column would be assigned to the variable. In JavaScript we have the following conditional statements: Use if to specify a block of code to be executed, if a specified condition is true. If statements can be used with else clause, If else if clause and as nested if to control the flow of the program execution. There are two methods I know of that you can declare a variable's value by conditions. JavaScript if statements run a block of code only if an evaluation of a given condition results in true.
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