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In Angular 2 how do I check if a property is an array?

I have tried constructor but get a function as below: 

function Array() { [native code] }

My Code:

let content: any = {id: '1324234', value:{id:null}};
if(content.value.constructor === 'Array'){
 console.log('It is an array');
} else {
 console.log('Not an array');
}
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2
  • 1
    I guess there is nothing to do with angular2 Commented Dec 19, 2016 at 9:01
  • well Angular 2 does not have javascript function .isArray() Commented Dec 19, 2016 at 9:24

1 Answer 1

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42 
if(content.value instanceof Array){

See also Test for array of string type in TypeScript

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4 Comments

Could you please tell how to check this in a template?
@VikramSingh You can't. You can put this code into a function and call the function from the template (which is usually a bad idea because of performance issues of calling functions from templates). Rather store the result in a variable and bind to this variable from the template.
but i have dynamic object and i have to display key value pairs in html only if the value is not an Array. I am going with method approach. If you have any better idea please tell me.
Prepare a data structure that contains the data and the result of the type test and use this data structure in the template.

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