How to store input value in javascript local storage in the form of array? [duplicate]

You should use concat in this context to achieve your goal.

var foo = ["Hello"].concat(" word");
console.log(foo)

That is because you are storing the value that push returns on the variable foo:

The push() method adds one or more elements to the end of an array and returns the new length of the array.

You can do it this way:

var arr = ["hello"];
arr.push(" word");
console.log(arr);

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