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ES6 - else…if Ladder
The else…if ladder is useful to test multiple conditions. Following is the syntax of the same.
if (boolean_expression1) { //statements if the expression1 evaluates to true } else if (boolean_expression2) { //statements if the expression2 evaluates to true } else { //statements if both expression1 and expression2 result to false }
When using if…else statements, there are a few points to keep in mind.
- An if can have zero or one else's and it must come after any else if's.
- An if can have zero to many else if's and they must come before the else.
- Once an else if succeeds, none of the remaining else if's or else's will be tested.
Example: else…if ladder
var num=2 if(num > 0) { console.log(num+" is positive") } else if(num < 0) { console.log(num+" is negative") } else { console.log(num+" is neither positive nor negative") }
The code displays whether the value is positive, negative, or zero.
The following output is displayed on successful execution of the above code.
2 is positive
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