function declaration and function definition in javascript
//Function declarations load
//before any code is executed
//while
//Function expressions load
//only when the interpreter reaches that line of code.
//eg.
add(1,2);
function add(a,b){ //this is a function declaration
return a+b;
}
sum(1,5); //this is a function expression will throw initialization error
const sum = () => a+b; //function expression is strored in variable
4.17
6
//1st (simple function)
function hello1() {
return "Hello simple function";
}
//2nd (functino expression)
hello2 = function() {
return "Hello functino expression";
}
// 3rd ( IMMEDIATELY INVOKED FUNCTION EXPRESSIONS (llFE))
hello3 = (function() {
return "Hello IMMEDIATELY INVOKED FUNCTION EXPRESSIONS (llFE)";
}())
//4th (arrow function)
hello4 = (name) => { return ("Hello " + name); }
//OR
hello5 = (name) => { return (`Hello new ${name}`) }
document.getElementById("arrow").innerHTML = hello4("arrow function");
document.write("<br>" + hello5("arrow function"));
Thank you!
6
4.17
(6 Votes)
0
0
1
//Four ways to declare a function
function add(a, b) {
return a + b;
}
var add = function(a, b) {
return a + b;
}
var add = (a, b) => {
return a + b;
}
var add = (a, b) => a + b;
Thank you!
1
0
0
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