I need assistance with converting the code snippet below as I suspect it is related to an ES5/ES6 compatibility issue. Any help would be highly appreciated.
this.rows = Array.from(Array(Math.ceil(this.subCategoryModels.length / 3)).keys());
Upon attempting this conversion, I encountered TypeScript errors:
[ts]
Property 'from' does not exist on type 'ArrayConstructor'.
any
as well as
[ts]
Property 'keys' does not exist on type 'any[]'.
any
You may encounter an issue with the property 'from' not existing on type 'ArrayConstructor'.
This indicates a desire to utilize ES6 type definitions while compiling to ES5.
It is suggested to use the lib option in TypeScript's latest version:
"compilerOptions": {
"target": "es5",
"lib": ["es6", "dom"]
}
If you're encountering these issues, it's likely because your code is being compiled to ES5. To resolve this, consider using the typings tool to help Typescript recognize the es2015 functions related to arrays.
To start, make sure to install typings if you haven't done so already.
npm install typings --global
After setting up typings, proceed to add type definitions for ES2015 array functions.
typings install -SG env~es2015-arrayIn case you are targeting a browser that lacks support for the new Array functions, remember to include a polyfill as well.
Here is the code snippet that I used:
HTML
<ion-row *ngFor="let trio of getTriples()">
<ion-col *ngFor="let item of trio" (click)="itemTapped(item)">
<div class="row responsive-md">
<div id="icon-image-{{item.id}}"><img src="data:image/png;base64,{{item.icon}}" height="75" width="75" /></div>
<p>{{item.name}}</p>
</div>
</ion-col>
</ion-row>
TypeScript
getTriples() {
let triples = [];
let length = this.subCategoryModels.length;
for (let i = 0; i < length; i += 3) {
let trio = [];
trio.push(this.subCategoryModels[i]);
if (i + 1 < length) {
trio.push(this.subCategoryModels[i + 1]);
}
if (i + 2 < length) {
trio.push(this.subCategoryModels[i + 2]);
}
triples.push(trio);
}
return triples;
}
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