Just a quick query as I seem to be encountering some peculiar bugs and can't seem to find any information on this issue. Does the order in which functions are defined within a file make a difference?
Take for instance:
function c() {
d(); //defined after the current function
}
function d() {
//perform some action
}
Is it best practice to consider the order or should I not worry about it?
The concept of variable hoisting in JavaScript means that "var statements and function declarations will be moved to the top of their enclosing scope" [1].
While this behavior can sometimes lead to unexpected results, as long as the file containing the function is loaded, the order of declaration should not impact functionality.
[1] ,
The sequence in which functions are defined does not affect their execution in JavaScript, as long as the invoked function is already declared.
The issue you are encountering is due to variable hoisting. To learn more about this concept, click here
According to Crockford's JSLint, it is not recommended to do this. However, as long as you define the functions in that manner, it should not be a problem. For example, your code will function correctly with:
function a(){
b();
}
function b(){
//do something
}
but it may not work with:
function a(){
b();
}
var b=function(){//do something};
Essentially, if everything is loaded before you call it, you should not encounter any issues. Consider wrapping it in a $("window").load()
The location of a function does not affect its behavior in JavaScript. It can be placed at the top, bottom, or even in a separate file; what matters is that it exists.
When JavaScript is loaded, all functions are treated as part of a single script. This means that you cannot have two functions with the same signature in different script files used on the same page.
Check out examples on JS cases
x();
y();
function x() {
z(); //defined later in the code
}
function z() {
alert("calling z");
}
function y() {
z(); //defined earlier in the code
}
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