Function Definition

by Shane Porter

JavaScript

/**
 * Function Definition
 */

// statement/declaration
function add(a, b) {
    return a + b;
}

console.log(add(1, 2)); // 3

// expression
var add = function (a, b) {
    return a + b;
}

console.log(add(1, 2)); // 3

var add = function (a, b) {
    return a + b;
}

// function constructor
var add = new Function("a", "b", "return a+b;");
console.log(add(1, 2)); // 3

/**
 * Properties
 */

// example of "arguments" property
var sum = function () {

    var i,
        sum = 0;

    for (i = 0; i < arguments.length; i += 1) {
        sum += arguments[i];
    }

    return sum;

}

console.log(sum(4, 8, 15, 16));