Array<object> in typescript

Question

I wanna add an object to an array but I don't know how to declare a variable with the return type is Array<object>.

My example:

var obj = {
   'Prop name': 'Prop value'
};

document.body.innerHTML = typeof obj; // output: object

var arr: Array<object>; // error message: Cannot find name 'object'
arr.push(obj);

I've tried again with:

var obj: Object = {
   'Prop name': 'Prop value'
};

document.body.innerHTML = typeof obj; // output: object

var arr: Array<Object>;
arr.push(obj); // error message: Cannot read property 'push' of undefined

How can I fix the issue?

Richard Szalay · Accepted Answer · 2016-01-25 07:07:29Z

1

The first error is because it's Object (title case) not object (lower case)

The second error is because you've typed the variable, but not actually assigned an instance. Try:

var arr: Array<Object> = [];
arr.push(obj);

answered Jan 25, 2016 at 7:07

Richard Szalay

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MartyIX · Accepted Answer · 2016-01-25 07:16:58Z

1

You miss initialization of arr array:

var obj: Object = {
   'Prop name': 'Prop value'
};

document.body.innerHTML = typeof obj; // output: object

var arr: Array<Object> = []; // MODIFIED
arr.push(obj);

answered Jan 25, 2016 at 7:16

MartyIX

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Comments

vzayko · Accepted Answer · 2016-01-25 07:11:12Z

0

You should use Object or any instead:

var arr: Array<any>;

answered Jan 25, 2016 at 7:11

vzayko

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