Function createIterable

Example

let current = 0;
let next = 1;
let done = false;
let fibCtx: CreateIteratorContext<number> = {
    n: function() {
        fibCtx.v = current;
        current = next;
        next = fibCtx.v + next;

        // Return not done
        return false;
    },
    r: function(value) {
        done = true;
        return value;
    }
};

let values: number[] = [];
iterForOf(createIterable(fibCtx), (value) => {
    values.push(value);
    if (values.length === 10) {
        return -1;
    }
});

// Done is true
// done === true
// Values: [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
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