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javascript isset equivalent

i was just looking for an equivalent to the isset in php for javascript, i was initially using .length but this can still cause errors so i found this solution. if (typeof my_var !== 'undefined') {}

6:39 am, May 19, 2020
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:checked

The :checked CSS pseudo-class selector represents any radio (<input type="radio">), checkbox (<input type="checkbox">), or option (<option> in a <select>) element that is checked or toggled to an on state.
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