How can i delete an object in a array?

i have a problem for delete and Object in a array. I think the solution is very simple but i am not good in javascript.

This is my array

I want delete the value in this array but i have a problem because its something like that in js:

myArray = [Object1,Object2,...]

and in the object Object1 = {SUM: "-0.75" , mont: "1", name: "test", value: "{"25":"test"}, year: "2017"}

Thanks for your help.