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at November 13, 2007 18:26 by 1man
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function operators(){
//Use of in Operator
var o = {x: 1, y: 2};//Create object
var haveX = "x" in o;//true
var haveY = "y" in o;//true
var haveZ = "z" in o;//false
var haveMethod = "toString" in o;//true (inherited property)
console.log(haveX, haveY, haveZ, haveMethod);
var a = [1, 2, 3];
var check1 = a instanceof Array;//true
var check2 = a instanceof Object;//true (array is an object)
var check3 = a instanceof RegExp;//false
console.log(check1, check2, check3);
var d = new Date();
var check1 = d instanceof Date;//true
var check2 = d instanceof Object;//true
var check3 = d instanceof Number;//false
console.log(check1, check2, check3);
}
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Basic usage of the in and instanceOf operators.
Initial Title
Basic Usage of the 'in' and 'instanceOf' Operators
Initial Tags
javascript
Initial Language
JavaScript