use ngif to chcek binding value code example

Example 1: ngif

         
Next
   
--While (t/f boolean variable called "flag") is true
  This button will be visible + click button executes function
  Once this "flag" becomes false this button disapears

Example 2: angular conditional directives

//if 
 
   
  //if [condition]==true the div will be shown

//for 

  
 {{i}} {{data.title}} 
  
  
   
  //the data contained in an array will be displayed element by element
  //similar to the function .map() in React

// ngStyle (conditional Style)

  
 {{i}} {{data.title}} 

  
 

//if the index of the element is 1 or 0, the background will be red, if it is over 1 the background will be green