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What reduce(function) will do in component.find() in Salesforce Lightning?
What reduce function will do var allValid = component.find('contactField').reduce(function (validFields,
inputCmp)? -
5 Replies
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Hello Anjali,
Reduce() - The reduce() method applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value.
In your code , it takes a function as input and applies that on the component.find(‘contactField’) and returns the output.
Thanks.
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Hi Anjali,
reduce function is part of array prototype javascript object. It takes a function as input and applies that on the array and returns the output.
The reduce() method applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value.
var total = [0, 1, 2, 3].reduce(function(sum, value) {
return sum + value;
}, 0);
// total is 6 -
Hi,
reduce() is javaScript array method, actually this is the syntax of this method :
syntax : array.reduce(function(total, currentValue, currentIndex, arr), initialValue)
In your scenario it will return field value from given field in InpCmp.
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Hi,
Example of reduce()
const array1 = [1, 2, 3, 4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;// 1 + 2 + 3 + 4
console.log(array1.reduce(reducer));
// expected output: 10// 5 + 1 + 2 + 3 + 4
console.log(array1.reduce(reducer, 5));
// expected output: 15Hope this helps.
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How to use in Lightnign coe snippet:
// If there are more than 1 fields
if(contactFields.length!=undefined) {
// Iterating all the fields
var allValid = contactFields.reduce(function (validSoFar, inputCmp) {
// Show help message if single field is invalid
inputCmp.showHelpMessageIfInvalid();
// return whether all fields are valid or not
return validSoFar && inputCmp.get('v.validity').valid;
}, true);Thanks
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