Update jsx-in-depth.md

[bukulele]

The example in section "Functions as Children" works only with "0" index in props.children, because props.children is an array-like object, where the function is the value of the first property.

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[eps1lon]

The example in section "Functions as Children" works only with "0" index in props.children, because props.children is an array-like object, where the function is the value of the first property.

Not in this specific example. Are you maybe trying this example in preact?