While exploring the functionality of filters in AngularJS, I came across the requirement to send two sets of parentheses.
$filter('number')(number[, fractionSize])
What does this mean and how can we manage it with JavaScript?
While exploring the functionality of filters in AngularJS, I came across the requirement to send two sets of parentheses.
$filter('number')(number[, fractionSize])
What does this mean and how can we manage it with JavaScript?
This concept illustrates how the initial function, in this case $filter, generates and executes a secondary function all at once. This mechanism allows for chaining functions together seamlessly. As demonstrated by:
function multiply(x){
return function(y){
return x * y;
};
}
var multiplyByTwo = multiply(2);
multiplyByTwo(5) === 10; // true
multiply(3)(4) === 12; // true
The $filter('number') function gives back a new function that needs two inputs, the first one is necessary (a number) and the second one is optional (the decimal precision).
You can directly utilize the new function like this:
$filter('number')('123')
Alternatively, you have the option to store the new function for later use:
var numFilter = $filter('number');
numFilter('123')
Here is an equivalent representation:
const filterFunc = $filter('number');
filterFunc(number[, decimalPlaces]);
The $filter() function retrieves a reference to a different function.
Utilizing ES6 or later versions, you have the ability to achieve this in the following manner;
const divideBoth = (x) => (y) => {
return x / y;
};
One advantage of this function type is its utility in cases where a react.js component requires a callback function instead of an inline approach (such as ()=>return value). This allows for flexibility and organization within your codebase. However, caution should be exercised when using this method in event callbacks as it may execute during the initial render, potentially leading to unforeseen issues.
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