Loop through an array of objects using Typescript

Question

Loop through an array of objects using Typescript

Currently, I am facing a challenge in Angular 2 where I have an array of objects that I need to iterate over. However, I also need to limit the display length of a specific key's string value within each object.

this.productService.loadAllProducts(product).subscribe(data => {
      if (this.authService.checkActiveSession(data)) {
        if (data.success) {
         //console.log(this.product_desc.substring(0,2))
             for(let i=0;i<data.products.length ;i++){  //I'm struggling with iterating properly here!!
             console.log(data.products[0].product_desc)
          }
          this.source.load(data.products);
         } else {
          console.log('Not binded');
        }
      }
    });
  }

To achieve this, I've attempted to limit the length of the product description to 10 characters by using:

For example:

this.product_desc.substring(0,10)

javascript angular typescript

Answer 1

Answer №1

To manipulate arrays, you have the option of utilizing the forEach function that comes pre-installed.

See an example below:

// Reduce all product descriptions to a maximum length of 10 characters
data.products.forEach( (item) => {
    item.product_desc = item.product_desc.substring(0,10);
});

Your approach was not incorrect. It could be enhanced as follows:

for(let index=0; index<data.products.length; index++){
    console.log(data.products[index].product_desc); // Use 'index' instead of '0'
}

Answer 2

To manipulate arrays, you have the option of utilizing the forEach function that comes pre-installed.

See an example below:

// Reduce all product descriptions to a maximum length of 10 characters
data.products.forEach( (item) => {
    item.product_desc = item.product_desc.substring(0,10);
});

Your approach was not incorrect. It could be enhanced as follows:

for(let index=0; index<data.products.length; index++){
    console.log(data.products[index].product_desc); // Use 'index' instead of '0'
}

Answer 3

Answer №2

If you're working with Typescript and ES6, you have the option to utilize for..of:

for (let item of items) {
    console.log(item.item_name);
}

This code snippet will be converted to JavaScript as:

for (let _i = 0, items_1 = items; _i < items_1.length; _i++) {
    let item = items_1[_i];
    console.log(item.item_name);
}

Answer 4

If you're working with Typescript and ES6, you have the option to utilize for..of:

for (let item of items) {
    console.log(item.item_name);
}

This code snippet will be converted to JavaScript as:

for (let _i = 0, items_1 = items; _i < items_1.length; _i++) {
    let item = items_1[_i];
    console.log(item.item_name);
}

Loop through an array of objects using Typescript

Answer №1

Answer №2

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