.every function in typescript + angular 2

Question

I am using every function to check if a particular checkbox in the grid is checked or not, I am using angular 2 and below is my code to do that:

// Typescript code
this.toggle = this.contactlist.every(item => item.checked);

// JS output is
this.toggle = this.contactlist.every(function(item) {
   return item.checked;
});

Now I want to include more code inside that every function so I tried this:

this.toggle = this.contactlist.every(item => {
    item.checked; 
    console.log('Item:', item)
});

// In Webpack it gives me this error
Argument of type '(item: any) => void' is not assignable to parameter of type '(value: any, index: number, array: any[]) => boolean'.
  Type 'void' is not assignable to type 'boolean'.

How I can solve it?

harishr · Accepted Answer · 2016-07-18 08:50:33Z

6

change it to

this.toggle = this.contactlist.every(item => {
    console.log('Item:', item)
    return item.checked; 
});

add return part

answered Jul 18, 2016 at 8:50

harishr

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1 Comment

Maximilian Riegler Over a year ago

One could add why lambdas behave this way.

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