I have object
var emailData = new {};
emailData.Id;
emailData.EmailAddress;
later in code I'm populating array with emailData objects
var emailDataArr = new Array();
emailDataArr.push(..someobject...);
how can I check does any object on property EmailAddress inside emailDataArr array is equal to some string?
You can get that by using Array.prototype.some. Here's an example:
function hasAddress( array, address ) {
return array.some(function(data) {
return data.EmailAddress === address;
});
}
var emailDataArr = new Array();
emailDataArr.push(/* Data */);
console.log( hasAddress( emailDataArr, 'SomeString' ) );
data.EmailAdress === null will return true. So while the idea is right, the checking is incorrect and is not answering the current question which is compare against string
typeof string.some() executes the callback function once for each element present in the array until it finds one where callback returns a true value. If such an element is found, some() immediately returns true That's mean that if fine a match in the first element will not evaluate the rest of them, What you did is the same that go over the array and do (item.indexOf(address) > -1) Sorry but IMO the answer is wrong
You can go to http://jsfiddle.net/du2b6r1y/ and see live example.
//https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/create
var emailData = {}; //Please use Object.create instead of new {}; if that not possible you simple should use {}
// you can also
var emailDataArr = [
{
Id: 1,
EmailAdress : "nadf@asdfa"
},
{
Id: 2,
EmailAdress : "adfasd@asdfa"
},
{
Id: 3,
EmailAdress : null
}
]; //please avoid new in all you javascript code if possible
var filter = emailDataArr.filter(function(email) {
return typeof email.EmailAdress === "string";
});
console.log(filter);
//you will get only emails that are strings
//[object, object];
//or you can go over each of them and compare them
emailDataArr.forEach(function(email) {
if(typeof email.EmailAdress === "string") {
//do your thing
console.log("is a string");
}
});
.some()