Accessing an object property based on an array value

Question

I would like to access an object property based on the first value in it's array.

var LANGS = {
    "C#": [10, "text/x-csharp", "code"],
    "C/C++": [7, "text/x-c++src", "code"]
};

So I want to be able to access "C#" by the 10 in its array, how would I do this?.

Answer 1

You can use for-in to loop through the object's property names, and then get the value of the property using the name in order to check its first element:

var LANGS = {
    "C#": [10, "text/x-csharp", "code"],
    "C/C++": [7, "text/x-c++src", "code"]
};
function getEl(number) {
    for(var el in LANGS) {
        if(LANGS[el][0] == number) {
            return el;
        }
    }
}
alert(getEl(10));

Demo: http://jsfiddle.net/Lgp4zazq/

Answer 2

 var LANGS = { "C#": ["text/x-csharp", "code",10], "C/C++": [7, "text/x-c++src", "code"] }; function getEl(number) { for(var el in LANGS) { debugger var array = []; array = LANGS[el]; if(array.indexOf(number) > -1) { return el; } } } alert(getEl(10));