+ 2
Looping through json
Hi guys assume you have a json object like this { meal:beans, Image:pexels.com Health :true ingredient1:onions, ingredient2:potatoes, ingredient3:beans, } How do you loop through to console.log all your ingredients, assuming your object has 25 ingredients
4 Antworten
+ 8
for ( var key in myJSON){
if ( key.indexOf("ingredient") == 0){
console.log(myJSON[key]);
}
}
+ 4
The for...in loop is intended for iterating over the enumerable keys of an object.
https://www.sololearn.com/learn/JavaScript/2970/?ref=app
That's how it moves to the next object key. This iterates over ALL enumerable keys but we only want to log the "ingredients".
indexOf is a string method that returns the index where a given string is located in the string that called the method. -1 is returned when the substring is not found.
E.g:
"abcdef".indexOf ("b") == 1; //true
"abcdef".indexOf ("bcdef") == 1; //true
"abcdef".indexOf ("fgh") == -1; //true
The if statement could be read this way:
if (the key has "ingredient" as a substring [from index 0] )
Then console.log(myJSON [key] ) to get the value.
or
if (the key starts with "ingredient")
Then log the value.
In ES6 and above the if statement is easier to write and read :
if(key.startsWith("ingredient"){
console.log(myJSON [key])
}
John Bryan You are very welcome.
+ 1
Got it
Thanks Kevin Star
0
This worked
But could you please explain the if statement
Isn't the 0 supposed to increment(++) or how does it move to the next ingredient