How to parse or loop this [closed] - javascript

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I have tried everything I can think of to get the data but cannot figure this out.
The data is in a structure like this:
[{"code":1000,"day":"Sunny","night":"Clear","icon":113,"languages":
[{"lang_name":"Arabic","lang_iso":"ar","day_text":"مشمس","night_text":"صافي"}]
}]
I've tried looping, using key:value using the dot notation and bracket notation and cannot get the info.
I'm trying to get to the "languages" so I can parse them for the weather.


var arr = [{"code":1000,"day":"Sunny","night":"Clear","icon":113,"languages":
[{"lang_name":"Arabic","lang_iso":"ar","day_text":"مشمس","night_text":"صافي"}]
}]
arr.forEach(function(obj){ //loop array
obj.languages.forEach(function(language) { //loop languages
console.log(language); //language object
console.log(language.lang_name); //language property
});
});

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How to Filter an array of strings based on first word in the string in javascript? [closed]

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With the following array of strings in javascript, is there a way to use the .filter to filter by the first word?
['Desk_One', 'Desk_Two', 'Desk_Three', 'Chair_One', 'Chair_Two']
For example to .filter(x = 'Desk_*')
['Desk_One', 'Desk_Two', 'Desk_Three']
Maybe this needs to be a regex

You can use startsWith() function like this:
let array = ['Desk_One', 'Desk_Two', 'Desk_Three', 'Chair_One', 'Chair_Two'];
let result = array.filter((item)=>item.startsWith(array[0].split('_')[0]));
console.log(result)

How to get every element in an array in an if statement js [closed]

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So I’m trying to check names through an array and I don’t want to have to use
if (<array name>[0,1,2,3,4,5,6,7])
{ code in here }

depend on what you are trying to do u can use forEach or map
let arr = [1,2,3,4,5,6,7,8,9,10];
arr.forEach((item)=>{
console.log(`${item} is greater than 5 : ${item>5}`)
})

How do I get length of my Json Object [closed]

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Below is my JSON object
{"Decision":[{"recid":"1183","reason":"Approved as Requested","decision":"Approved","approvalamt":"","comment":""},{"recid":"662","reason":"3","decision":"Rejected","approvalamt":"","comment":""},{"recid":"752","reason":"Approved People Resources; But No Funding Approved","decision":"Approved","approvalamt":"","comment":""}]}
How do I get length of this.In this example it should return me 3.
My Object name is DecisionObj which have above listed elements.

var string = '{"Decision":[{"recid":"1183","reason":"Approved as Requested","decision":"Approved","approvalamt":"","comment":""},{"recid":"662","reason":"3","decision":"Rejected","approvalamt":"","comment":""},{"recid":"752","reason":"Approved People Resources; But No Funding Approved","decision":"Approved","approvalamt":"","comment":""}]}';
var object = JSON.parse(string);
alert(object.Decision.length);

Arrays have length property. You can use that.
var length = DecisionObj.length;

Javascript array of object [closed]

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I want to have an array containing an object. For example I have an object like this:
parentObj:{
childObj1,
childObj2
}
but I want to have a "parentObj" array and be able to call it like :
parentObj[0].childObj1
I searched a lot but didn't find anything related to this. I'll appreciate if someone can help me with this.
thanks very much

Here's an array of objects:
var a = [
{name: "first"},
{name: "second"}
];
console.log(a[0].name); // "first"
console.log(a[1].name); // "second"
The [] is an array initializer. The {} is an object initializer.

Math on values inside an array [closed]

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I was looking for some way to make calculations on values inside array. I know that I can sum the values, sort it or returs max/min. But I am novice and i do not find anything about harder math. I have formula:
http://i.imgur.com/O5tNmMh.jpg
(can't attach images yet...)
And I have an array [somex, somey, somex, somey,somex, somey, ....] Is it possible to calculate the thing like that?

you need some logic like this:
int current=0 ,previous=0,yoursum=0;
for(i=0;i<no. of elements in array;i++)
{
current=arr[i];
else
{
yoursum+=previous-current;
previous=current;
}
}

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