How to string concatenation [Solved]

I want to read array and set id to string value.
This is the way I code ,please help me to sort this out

var a;
      this.selectedProductIds.forEach(element => {


Hi, you could do something like this

const selectedProductIds = [1, 3, 5, 7];

const a = selectedProductIds.join(’ ');

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Thank you @ormasoftchile , This is work for me

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