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JavaScript - for...in statement
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In this article, we would like to show you how to use for...in statement in JavaScript.
The for...in loop is used to iterate over enumerable and non-Symbol properties.
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for (variable in object) {2
// statement3
}In this example, we iterate over an object to log its keys/values in the console.
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var object = {2
key1: {3
name: 'John',4
age: 43,5
},6
key2: {7
name: 'Kate',8
age: 54,9
},10
key3: {11
name: 'Diego',12
age: 21,13
},14
};15
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for (var key in object) {17
if (object.hasOwnProperty(key)) {18
var entry = object[key];19
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console.log(key + ' : ' + entry.name + ', ' + entry.age);21
}22
}Output:
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key1 : John, 432
key2 : Kate, 543
key3 : Diego, 21