I need to create duplicates of an array of objects multiple times, as I require each one for different uses.
if(!this.tempLookups){
for (let count = 0; count < this.dates.length; count++) {
this.tempLookups[count] = this.lookups[key];
}
}
An error occurred: Uncaught (in promise) TypeError: Cannot set property '0' of null
The main cause of the error lies within the error message indicating an attempt to set a property for a null value. To resolve this, it is recommended to define the property after the if statement.
if(!this.tempLookups){
his.tempLookups = [];
for (let count = 0; count < this.dates.length; count++) {
this.tempLookups[count] = this.lookups[key];
}
}
To achieve the same result in a more concise manner without using a for loop, you can utilize the Array#fill method since you are filling with identical values.
if(!this.tempLookups){
this.tempLookups = new Array(this.dates.length).fill(this.lookups[key]);
}
To achieve this, follow these steps:
if (!this.tempLookups) {
this.tempLookups = [];
for (let i = 0; i < this.dates.length; i++) {
this.tempLookups.push(Array.from(this.lookups[key]));
}
}
It is important to note that the this.tempLookups variable is set as an empty array at the beginning to avoid any conflicts when inserting data. Using the Array.from method within the for loop ensures that each iteration creates a shallow copy of the this.lookups[key] array. This prevents changes made to one array from affecting all others, as they are separate arrays and not just references to the same array.
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