Basic JavaScript Question: Download JavaScript PDF
What is bind in javascript?
Answer:
Functions are objects in JavaScript, as we should know well by now, and as objects, functions have methods, including the powerful Apply, Call, and Bind methods.
// Define the original function.
var checkNumericRange = function (value) {
if (typeof value !== \'number\')
return false;
else
return value >= this.minimum && value <= this.maximum;
}
// The range object will become the this value in the callback function.
var range = { minimum: 10, maximum: 20 };
// Bind the checkNumericRange function.
var boundCheckNumericRange = checkNumericRange.bind(range);
// Use the new function to check whether 12 is in the numeric range.
var result = boundCheckNumericRange (12);
document.write(result);
// Output: true
// Define the original function.
var checkNumericRange = function (value) {
if (typeof value !== \'number\')
return false;
else
return value >= this.minimum && value <= this.maximum;
}
// The range object will become the this value in the callback function.
var range = { minimum: 10, maximum: 20 };
// Bind the checkNumericRange function.
var boundCheckNumericRange = checkNumericRange.bind(range);
// Use the new function to check whether 12 is in the numeric range.
var result = boundCheckNumericRange (12);
document.write(result);
// Output: true