Cannot assign to read only property of object '[object Object]' code example

Example 1: Cannot assign to read only property 'value' of object '[object Object]

elementReadOnly = {...elementReadOnly, fieldModified: value};

Example 2: Cannot assign to read only property '0' of object '[object Array]'

array = array.slice().sort((a, b) => b.stats.speed - a.stats.speed)