Loop through object get value using regex key matches Javascript

Question

var obj = {
 Fname1: \"John\",
 Lname1: \"Smith\",
 Age1: \"23\",
 Fname2: \"Jerry\",
 Lname2: \"Smith\",
 Age2: \"24\"
}

with an object like this.

Answer 1

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)