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What is the difference between a function expression vs declaration in Javascript?

I am a web developer with prime experience in HTML, ASP.NET. I know very little javascript, enough to do simple tasks in web programming. Lately, while reading Jquery and other complex javascript files, I have been observing lot of javascript code as below:

var increment = function(x){
    return x + 1;
}

I want to know if this is conceptually same as below, which I have been more used to :

function increment(x){
    return x + 1;
}

And, if its same, why am I seeing lot of use of first notation rather than second ?

Answer 1

The difference is that
var increment = function(x){
return x + 1;
}
is defined at parse-time for a script block, whereas function increment(x){
return x + 1;
} is defined at run-time.
see this:

<script>
increment();

var increment = function()
{
}
</script>

this will give you error.. .while

<script>

increment();

function increment()
{
}
</script>

will not give you error. .