JavaScript Conditions JAVASCRIPT
- JavaScript Introduction
- JavaScript Syntax
- JavaScript innerHTML
- JavaScript document.write()
- Javascript - window.alert()
- JavaScript - console.log()
- JavaScript Comments
- JavaScript Variables
- JavaScript Operators
- JavaScript Data Types
- JavaScript Functions
- JavaScript Objects
- JavaScript Events
- JavaScript Strings
- JavaScript String Methods
- JavaScript Numbers
- JavaScript Number Methods
- JavaScript Arrays
- JavaScript Array Methods
- JavaScript Sorting Arrays
- JavaScript Array Iteration
- JavaScript Date Objects
- JavaScript Date Formats
- JavaScript Get Date Methods
- JavaScript Set Date Methods
- JavaScript Math Object
- JavaScript Conditions
- JavaScript Switch
- JavaScript Loop For
- JavaScript While Loop
- JavaScript Break and Continue
- JavaScript Type Conversion
- JavaScript Errors
- JavaScript Scope
- JavaScript this Keyword
- JavaScript Classes
- JavaScript Debugging
- JavaScript - Changing CSS
- JavaScript JSON
JavaScript Conditions
Conditional Statements
In JavaScript we have the following conditional statements:
- Use
ifto specify a block of code to be executed, if a specified condition is true - Use
elseto specify a block of code to be executed, if the same condition is false - Use
else ifto specify a new condition to test, if the first condition is false - Use
switchto specify many alternative blocks of code to be executed
The if Statement
Use the if statement to specify a block of JavaScript code to be executed if a condition is true.
Syntax
// block of code to be executed if the condition is true
}
Note: that if is in lowercase letters. Uppercase letters (If or IF) will generate a JavaScript error.
The else Statement
Use the else statement to specify a block of code to be executed if the condition is false.
// block of code to be executed if the condition is true
} else {
// block of code to be executed if the condition is false
}
The else if Statement
Use the else if statement to specify a new condition if the first condition is false.
Syntax
// block of code to be executed if condition1 is true
} else if (condition2) {
// block of code to be executed if the condition1 is false and condition2 is true
} else {
// block of code to be executed if the condition1 is false and condition2 is false
}
Example
if (time < 10) {
greeting = "Good morning";
} else if (time < 20) {
greeting = "Good day";
} else {
greeting = "Good evening";
}
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