How can I check whether a JavaScript object contains a value in it or not?

Question

0:{date: "2021-1-9", views: 32109, clicks: 279, likes: 4391} 1: {date: "2021-1-10", views: 127568, clicks: 691, likes: 8471} 2: {date: "2021-1-11", views: 17304, clicks: 94, likes: 764} 3: {date: "2021-1-12", views: 11008, clicks: 49, likes: 421} 0: {date: "2021-1-9", views: 32109, clicks: 279} 1: {date: "2021-1-10", views: 127568, clicks: 69} 2: {date: "2021-1-11", views: 17304, clicks: 94} 3: {date: "2021-1-12", views: 11008, clicks: 49} 0: {date: "2021-1-9", views: 32109, likes: 4391} 1: {date: "2021-1-10", views: 127568,likes: 8471} 2: {date: "2021-1-11", views: 17304, likes: 764} 3: {date: "2021-1-12", views: 11008, likes: 421}

I have the above data, as you can see some don't have likes, some don't have clicks element, so I want to check whether they exist in the arrays or not and print as false for the particular element which does not exist in the array.

Object.hasOwnProperty() developer.mozilla.org/de/docs/Web/JavaScript/Reference/… — Aalexander
– Aalexander, Commented Jan 12, 2021 at 17:29
You want to print false if it has not the property likes for example? — Aalexander
– Aalexander, Commented Jan 12, 2021 at 17:32
yes, I want to print false it does not have property likes, and if it exists I want to print true @Alex — Abhi
– Abhi, Commented Jan 12, 2021 at 17:36

Aalexander · Accepted Answer · 2021-01-12 17:36:18Z

`Object.prototype.hasOwnProperty()`

You can check with the method hasOwnProperty() if the object has the key or not.

const obj = [{ date: "2021-1-9", views: 32109, clicks: 279, likes: 4391 }, { date: "2021-1-10", views: 127568, clicks: 691, likes: 8471 }, { date: "2021-1-11", views: 17304, clicks: 94, likes: 764 }, { date: "2021-1-12", views: 11008, clicks: 49, likes: 421 }, { date: "2021-1-9", views: 32109, clicks: 279 }, { date: "2021-1-10", views: 127568, clicks: 69 }, { date: "2021-1-11", views: 17304, clicks: 94 }, { date: "2021-1-12", views: 11008, clicks: 49 }, { date: "2021-1-9", views: 32109, likes: 4391 }, { date: "2021-1-10", views: 127568, likes: 8471 }, { date: "2021-1-11", views: 17304, likes: 764 }, { date: "2021-1-12", views: 11008, likes: 421 } ] let propToLookFor = "likes"; obj.forEach((x) => { if (x.hasOwnProperty(propToLookFor)) { console.log("True"); }else{ console.log("False"); } })

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How can I check whether a JavaScript object contains a value in it or not?

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`Object.prototype.hasOwnProperty()`

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Object.prototype.hasOwnProperty()

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`Object.prototype.hasOwnProperty()`