var obj = {
Fname1: "John",
Lname1: "Smith",
Age1: "23",
Fname2: "Jerry",
Lname2: "Smith",
Age2: "24"
}
with an object like this.Can i get the value using regex on key something like Fname*,Lname* and get the values.
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Is this object your creation, or someone else's?Blazemonger– Blazemonger2012-05-25 17:49:22 +00:00Commented May 25, 2012 at 17:49
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5 Answers
Yes, sure you can. Here's how:
for(var key in obj) {
if(/^Fname/.test(key))
... do something with obj[key]
}
This was the regex way, but for simple stuff, you may want to use indexOf(). How? Here's how:
for(var key in obj) {
if(key.indexOf('Fname') == 0) // or any other index.
... do something with obj[key]
}
And if you want to do something with a list of attributes, i mean that you want values of all the attributes, you may use an array to store those attributes, match them using regex/indexOf - whatever convenient - and do something with those values...I'd leave this task to you.
2 Comments
Blazemonger
@iambriansreed Yes, but we really should discourage using objects like the one OP has. It's inefficient in a lot of ways.
Blazemonger
@iambriansreed The object as it is written is clearly not JSON.
You can sidestep the entire problem by using a more complete object instead:
var objarr = [
{fname: "John", lname: "Smith", age: "23"},
{fname: "jerry", lname: "smith", age: "24"}
] ;
objarr[0].fname; // = "John"
objarr[1].age; // = "24"
Or, if you really need an object:
var obj = { people: [
{fname: "John", lname: "Smith", age: "23"},
{fname: "jerry", lname: "smith", age: "24"}
]} ;
obj.people[0].fname; // = "John"
obj.people[1].age; // = "24"
Now, instead of using a regex, you can easily loop through the array by varying the array index:
for (var i=0; i<obj.people.length; i++) {
var fname = obj.people[i].fname;
// do something with fname
}
Comments
values = []
for(name in obj) {
if (obj.hasOwnProperty(name) && name.test(/Fname|Lname/i) values[name] = obj[name];
}
Comments
With jquery:
$.each(obj, function (index,value) {
//DO SOMETHING HERE WITH VARIABLES INDEX AND VALUE
});
Comments
Quick key matcher using includes()
I love the new includes function. You can use it to check for the existence of a key or return its value.
var obj = {
Fname1: "John",
Lname1: "Smith",
Age1: "23",
Fname2: "Jerry",
Lname2: "Smith",
Age2: "24"
};
var keyMatch = function (object, str) {
for (var key in object) {
if (key.includes(str)) {
return key;
}
}
return false;
};
var valMatch = function (object, str) {
for (var key in object) {
if (key.includes(str)) {
return object[key];
}
}
return false;
};
// usage
console.log(keyMatch(obj, 'Fn')) // test exists returns key => "Fname1"
console.log(valMatch(obj, 'Fn')) // return value => "John"
If you haven't got ES2015 compilation going on, you can use
~key.indexOf(str)
Comments
