How to create array with loop for

Question

I have no idea to create array by json data

my code

for (let y of x.FACET){
    console.log(y["@KEY"])
    var numericArray: number[] = [y["@KEY"]];
    console.log(numericArray)
}

output

console.log(y["@KEY"]) show  
    1221 
    1334 
    1456 
    1876

console.log(numericArray) show
    ["1221"]
    ["1334"]
    ["1456"]
    ["1876"]

I want create [1221, 1334, 1456, 1876]; for sort number...

my listpage

<ion-list>
        <ion-item *ngFor="let item of  totalfilter">
          <p>{{item["@KEY"]}}</p>
        </ion-item>

        </ion-list>

before loop: var results = []; in loop: results.push(y["@KEY"]); — musefan
– musefan, Commented Mar 16, 2017 at 15:00
thanks for your help But I get error Cannot read property 'length' of undefined — ARR.s
– ARR.s, Commented Mar 16, 2017 at 15:07
Sorry, wasn't paying enough attention, my suggestion is javascript only. The posted answer is the same logic I was going for — musefan
– musefan, Commented Mar 16, 2017 at 15:11
Ahh , I'm sorry it's my mistake. your code is correct! thanks!!! — ARR.s
– ARR.s, Commented Mar 16, 2017 at 15:16

Poul Kruijt · Accepted Answer · 2017-03-16 15:44:11Z

2

You have to initialise the array first, and after that push the values in there

let numericArray: number[] = [];

for (let y of x.FACET){
    numericArray.push(y["@KEY"]));       
}

One line solution:

let numericArray: number[] = x.FACET.map(v => parseInt(v["@KEY"]));

To sort the x.FACET array you can do this:

x.FACET.sort((a: any, b: any) => {
    return parseInt(a["@KEY"]) - parseInt(b["@KEY"]);
});

edited Mar 16, 2017 at 15:44

answered Mar 16, 2017 at 15:08

Poul Kruijt

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1 Comment

ARR.s Over a year ago

I have one question , Can sort number by y["@KEY"] without create array? because I create array to sort number but list is not show by sort /// I editted post. please help me T-T

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