Here's the code snippet from the component with the conditional item in the password validators array: this.form = this.formBuilder. It allows for an if this, then that approach to coding, where certain actions or statements will only be executed if certain conditions are met. Form validation rules are defined for each field in an array, the password field is required when adding a new user, and is optional when editing an existing user. What is Javascript Conditional Statement A javascript conditional statement is a type of programming logic that allows the code to make decisions based on conditions set by the programmer. I used this technique recently in Angular for a dynamic form that supports adding or editing a user. When m圜ondition is true the array contains three items ( ), otherwise it contains two items ( ). Using the ternary and spread operators together we can initialize a javascript array with conditional items like this: const myArr = : )] ) can be used to copy the contents of one array into another, if the array being copied is empty nothing is copied into the new array. The ternary operator is an inline if/else statement with the syntax condition ? if : else. If the condition is false, the statement is skipped.This is a super quick post to show how to initialize an array with conditional values in JavaScript (or TypeScript). It reacts to a condition - if a condition is true, then whatever is inside the statement is run. if StatementsĪn if statement is the most basic type of conditional. And each choice along the way could be considered a conditional - the choice and the result of that choice. A morning routine has many more choices between the alarm going off and eating breakfast. As you can see, that's a really simple example. If you get up, you have time to get ready and have breakfast. That choice is a branching point - if you hit snooze, then you sleep more but don't have time for breakfast. When the alarm goes off, you can hit snooze or get up. Here's a example of conditionals in life. That is basically how conditionals work in programs - when you do one action, the program flows one way if you choose a different action, the program flows another way. Think of all the choices you make in a day and the results of those choices. Like a number of others on dev.to, I've decided to move my technical blog posts to this site.Ĭonditionals allow user interactions/choices and are used to control the flow of a program. This was originally posted on my site at on December 27, 2016.
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