block statement Javascript

block statement Javascript Share / Like

Javascript block statements are the curly braces ( { } ) you see everywhere. It is used to establish code that is to be compartmentalized into a specific function or statement. Many times the lines of code inside of a block statement will be indented to represent that they are part of that block statement. Below are some examples showing the curly braces establishing blocks of compartmentalized code.

Javascript CODE EXAMPLE

if (3 < 5) {

    // code for this block statement goes in here

}

for (var i = 0; i < 10; i++) {

    // code for this block statement goes in here

}

function myFunction () {

    // code for this block statement goes in here

}
</script>

TIP: You may come across code that processes just fine without the block statements in place(no curly brace nesting). This is because Javascript will execute all lines of code as one statement until it hits a semicolon( ; ), which is the statement break symbol in Javascript and many other languages.

Javascript CODE EXAMPLE

if(3 < 5)
document.write("EXPRESSION RETURNS TRUE")
else
document.write("EXPRESSION RETURNS FALSE");

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