ipavlic/apex-fp

Functional programming for Salesforce Apex

Apex FP

Apex FP provides functional constructs for SObject collections!

Read the documentation

Apex FP documentation

Deploy to Salesforce

Examples

Filter

List<Opportunity> largeOpportunities = SObjectCollection.of(opportunities)
	.filter(Fn.Match
		.field(Opportunity.Amount).greaterThan(150000)
		.also(Opportunity.AccountId).equals(accountId))
	.asList();

Map

List<Task> prospectingOpportunityTasks = SObjectCollection.of(Trigger.new)
	.filter(Fn.Match.recordFields(new Opportunity(Stage = 'Prospecting')))
	.mapAll(Fn.MapTo(Task.SObjectType)
		.setField(Task.Subject, 'Follow up')
		.mapField(Task.WhatId, Opportunity.Id))
	.asList();

List<Task> largeProspectingOpportunityFollowUpTasks = SObjectCollection.of(Trigger.new)
	.filter(Fn.Match.recordFields(new Opportunity(Stage = 'Prospecting')))
	.mapSome(
		Fn.Match.field(Opportunity.Amount).greaterThan(100000),
		Fn.MapTo(Task.SObjectType)
			.setField(Task.Subject, 'Follow up')
			.mapField(Task.WhatId, Opportunity.Id)
	)
	.asList();

Modify

List<Opportunity> largeOpportunities = SObjectCollection.of(opportunities)
	.forEach(Fn.Modify
		.setField(Opportunity.Rank__c, 'Excellent')
	)
	.asList();

Group

Map<Id, List<Account>> accountsByParentId = SObjectCollection.of(accounts).groupByIds(Account.ParentId);

Pick

List<Opportunity> idAndAmountOpportunities = SObjectCollection.of(opportunities)
	.pick(new Set<Schema.SObjectField>{Opportunity.Id, Opportunity.Amount})
	.asList();

Pluck

List<Decimal> amounts = SObjectCollection.of(opportunities).pluckDecimals(Opportunity.Amount);

Average

OptionalDecimal average = SObjectCollection.of(opportunities).mapToDecimal(Opportunity.Amount).average();

Sum

OptionalDecimal sum = SObjectCollection.of(opportunities).mapToDecimal(Opportunity.Amount).sum();

Min

OptionalDecimal min = SObjectCollection.of(opportunities).mapToDecimal(Opportunity.Amount).min();

Max

OptionalDecimal max = SObjectCollection.of(opportunities).mapToDecimal(Opportunity.Amount).max();