How can I reference variable while define it in Javascript?
var person = {
basic: {
name: 'jack',
sex: 0,
},
profile: {
AA: 'jack' + '_sth', # How can I write like this: AA: basic.name + '_sth'
},
};
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possible duplicate of reference variable in object literal?Quentin– Quentin2013-05-20 08:48:19 +00:00Commented May 20, 2013 at 8:48
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You cannot have a comma before closing an object literal: `, }' is not allowed.pvorb– pvorb2013-05-20 09:05:01 +00:00Commented May 20, 2013 at 9:05
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4 Answers
You can't.
You have to do
var name = 'jack';
var person = {
basic: {
name: name,
sex: 0
},
profile: {
AA: name + '_sth'
}
};
Just like this answer says, you could also do something like the following
function Person() {
this.basic = {
name: 'jack',
sex: 0
};
this.profile = {
AA: this.basic.name + '_sth'
};
}
var person = new Person();
But this creates an instance of Person, not a plain and simple JS object.
Comments
you just cant. other than work arounds like sushil's and pvorb's, you cant reference an object still being defined.
also you can try a getfunction
Comments
You could also use an Immediately Invoked Function Expression (IFFE) :
var person = function(name) {
var prsn = {
basic: {
name: name || 'anonymous',
sex: 0
}
};
return {basic: prsn.basic, profile: {AA: prsn.basic.name + '_sth'}};
}('Jack');
