Just a side node on this tutorial about if statements in javascript. The if statement use the if statement to specify a block of javascript code to be executed if a condition is true.
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The switch statement is described in the next chapter.
And if statement javascript. According to douglas crockford s javascript. The good parts 2008 o reilly the and operators are not part of the good parts of javascript and mr. Javascript statements often start with a keyword to identify the javascript action to be performed.
Statement2 statement that is executed if condition is falsy and the else clause exists. Can be any statement including further nested if statements. To group those statements.
Next we added a else if statement to check for another condition. Here is a list of some of the keywords you will learn about in this tutorial. If these conditions were met we display its the weekend in the month of june.
To execute no statements use an empty statement. To do that we can use the if statement and the conditional operator that s also called a question mark operator. The if statement is the fundamental control statement that allows javascript to make decisions and execute statements conditionally.
Statement that is executed if condition is truthy. Syntax the syntax for a basic if statement is as follows. Suppose the user entered 2 in this case the condition number 0 evaluates to true hence the body of the if statement is executed and the body of the else statement is skipped.
If that is also falsy. 1 the number is either a negative number or 0 the if else statement is easy. Crockford encourages the use of the and the operators instead as they are type sensitive that s my own terminology there and the outcome is easier to.
The if statement is a conditional statement available in javascript which is used to make a decision and execute a particular block of code only in case a certain condition is satisfied. By using if condition multiple times or nesting inside one in another we can achieve the end result required. In the if condition we added z 5 to check and see if we were in the month of june.
In javascript you have 0 to 11 for the months so the month of june would be 5. To execute multiple statements use a block statement. Javascript first checks year 2015.
If that is falsy it goes to the next condition year 2015. Visit our reserved words reference to view a full list of javascript keywords.
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