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Merge pull request #1372 from raphaelbn/patch-1

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[javascript/en] Added for/in loop JavaScript
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Levi Bostian 2015-10-09 10:02:12 -05:00
commit bd56a72723
1 changed files with 20 additions and 0 deletions
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javascript.html.markdown
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@ -218,6 +218,26 @@ for (var i = 0; i < 5; i++){
// will run 5 times
}
//The For/In statement loops iterates over every property across the entire prototype chain
var description = "";
var person = {fname:"Paul", lname:"Ken", age:18};
for (var x in person){
description += person[x] + " ";
}
//If only want to consider properties attached to the object itself,
//and not its prototypes use hasOwnProperty() check
var description = "";
var person = {fname:"Paul", lname:"Ken", age:18};
for (var x in person){
if (person.hasOwnProperty(x)){
description += person[x] + " ";
}
}
//for/in should not be used to iterate over an Array where the index order is important.
//There is no guarantee that for/in will return the indexes in any particular order
// && is logical and, || is logical or
if (house.size == "big" && house.colour == "blue"){
house.contains = "bear";