javascript syntax for check null or undefined or empty

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Oriana
05 Jan 2018
1if( typeof myVar === 'undefined' || myVar === null ){
2    // myVar is undefined or null
3}
source
Nathanael
07 Apr 2018
1if (typeof value !== 'undefined' && value) {
2    //deal with value'
3};
Olivia
20 Jan 2020
1// simple check do the job
2if (myString) {
3 // comes here either myString is not null,
4 // or myString is not undefined,
5 // or myString is not '' (empty).
6}
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