javascript check if set

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Rafael
02 Jul 2019
1if (typeof myVar !== 'undefined') {
2    // myVar is defined
3}
Garance
13 Oct 2017
1if (typeof variable !== 'undefined') {
2    // the variable is defined
3}
4//or
5if (typeof variable === 'undefined') {
6    // variable is undefined
7}
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