How can I filter for "mna" ===1 and ignore null values
const words = [null, null, {"mna":1}, {"mna":2}, {"mna":1}];
const result = words.filter(word => word.mna === 1);
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3 Answers
Just add it to the condition so you don't try to access mna unless it's truthy (null values are falsy so they will cause the condition to short circuit early)
const words = [null, null, {"mna":1}, {"mna":2}, {"mna":1}];
const result = words.filter(word => word && word.mna === 1);
console.log(result);
Comments
You can add word && word.mna === 1 to check if word is defined first. The value will be filtered out if it's falsy (null,undefined)
const words = [null, null, {"mna":1}, {"mna":2}, {"mna":1}];
const result = words.filter(word => word && word.mna === 1);
console.log(result);
Comments
Alternatively use
const words = [null, null, {"mna":1}, {"mna":2}, {"mna":1}];
const result = words.filter(word => word?.mna === 1);
console.log(result);Works also when the entry exists but the element is missing
const words = [{
"count": "3",
"noMNA": true
}, {
"count": "3",
"mna": 1
}, {
"count": "2",
"mna": 2
}, {
"count": "3",
"mna": 1
}];
const result = words.filter(word => word?.mna === 1);
console.log(result);