Null comparisons without type-checking operators may not work as intended JS-0059
Bug risk
8 months ago
—
8 months old
Use '===' to compare with null.
1513 var canvas = document.getElementById(tag_id).appendChild(canvas_el);
1514
1515 /* launch particle.js */
1516 if(canvas != null){1517 pJSDom.push(new pJS(tag_id, params));
1518 }
1519
Description
Comparing to null without a type-checking operator (=== or !==), can have unintended results as the comparison will evaluate to true when comparing to not just a null, but also an undefined value.
Bad Practice
if (flag == null) {
change();
}
while (isSet != null) {
handle();
}
Recommended
if (flag === null) {
change();
}
while (isSet !== null) {
handle();
}