for-in-loop

The search function in the following code is not working and I believe it has something to do with the For...In loop but I am new to JS and unsure why: var friends = { bill: { firstName: "bill", lastName: "smith", number: 1, address: ["1"] }, steve: { firstName: "steve", lastName: "smith", number: 2, address: ["2"] } }; var list = function(list) { for(var item in list) { console.log(item); } }; var search = function(name) { for(var friend in friends) { if(friend.firstName === name) { console.log(friend); return friend; } } }; search("steve"); The for in loop iterates over keys , not values.

I make use of a for in loop in a piece of JavaScript logic. Should I use the var keyword or not? When I run a for-in loop as per W3School's example, without the var then, as a side effect, it gets defined as a property on the global scope (window): (function () { var object = { a: 1, b: 2 } for (varName in object) { alert(varName + " is" + object[varName]) } })(); alert(window.varName) //Returns "b" ! //This returns undefined when the for-in is rewritten as for (var varName in object). edit: here is a fiddle of the above code for your enjoyment: http://jsfiddle.net/94uEh/ Which is the correct,

Is it possible to skip iterations of a for-in loop in Swift 3? I want to do something like this: for index in 0..<100 { if someCondition(index) { index = index + 3 //Skip iterations here } } Simple while loop will do var index = 0 while (index < 100) { if someCondition(index) { index += 3 //Skip 3 iterations here } else { index += 1 // anything here will not run if someCondition(index) is true } } The easiest way is using continue within the if condition for index in 1...100 { if index == 5 { continue } print(index)//1 2 3 4 6 7 8 9 10 } Or for index in 1...10 where index%2 == 0 { print(index)

I'm having trouble understanding the way this for in loop works. function createSimpleNode(name, options, text) { var node = document.createElement(name); for (var o in options) { node.setAttribute(o, options[o]); } if (text) { node.innerHTML = text; } return node; } Mritunjay The For in loop gives a way to iterate over an object or array with each value and key. It can be applied over an object or Array . For an Object For an object it gives each key in the object as the ITER variable. Using this variable you can get the corresponding value from object. var options = {a:1,b:2}; for (var key