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SyntaxError: "x" is not a legal ECMA-262 octal constant

SyntaxError warning in strict mode only.
Errors JavaScript Strict Mode SyntaxError Warning

SyntaxError: JSON.parse: bad parsing

SyntaxError
Errors JavaScript JSON Method Property SyntaxError

Array

The JavaScript Array object is a global object that is used in the construction of arrays; which are high-level, list-like objects.
Array Example Global Objects JavaScript Reference

Array.prototype[@@iterator]()

The initial value of the @@iterator property is the same function object as the initial value of the values() property.
Array ECMAScript6 Iterator JavaScript Method Prototype Reference

Array.prototype.copyWithin()

The copyWithin() method shallow copies part of an array to another location in the same array and returns it, without modifying its size.
Array ECMAScript6 JavaScript Method polyfill Prototype

Array.prototype.entries()

The entries() method returns a new Array Iterator object that contains the key/value pairs for each index in the array.
Array ECMAScript6 Iterator JavaScript Method Prototype

Array.prototype.every()

The every() method tests whether all elements in the array pass the test implemented by the provided function.
Array ECMAScript5 JavaScript Method polyfill Prototype

Array.prototype.fill()

The fill() method fills all the elements of an array from a start index to an end index with a static value.
Array ECMAScript6 JavaScript Method polyfill Prototype

Array.prototype.filter()

The filter() method creates a new array with all elements that pass the test implemented by the provided function.
Array ECMAScript5 JavaScript Method polyfill Prototype Reference

Array.prototype.find()

The find() method returns a value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.
Array ECMAScript 2015 ECMAScript6 JavaScript Method polyfill Prototype

Array.prototype.findIndex()

The findIndex() method returns an index in the array, if an element in the array satisfies the provided testing function. Otherwise -1 is returned.
Array ECMAScript6 JavaScript Method polyfill Prototype

Array.prototype.forEach()

The forEach() method executes a provided function once per array element.
Array ECMAScript5 JavaScript Method Prototype Reference

Array.prototype.includes()

The includes() method determines whether an array includes a certain element, returning true or false as appropriate. 
Array JavaScript Method polyfill Prototype Reference

Array.prototype.indexOf()

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
Array JavaScript Method polyfill Prototype Reference

Array.prototype.keys()

The keys() method returns a new Array Iterator that contains the keys for each index in the array.
Array ECMAScript6 Iterator JavaScript Method Prototype

Array.prototype.lastIndexOf()

The lastIndexOf() method returns the last index at which a given element can be found in the array, or -1 if it is not present. The array is searched backwards, starting at fromIndex.
Array ECMAScript5 JavaScript Method polyfill Prototype

Array.prototype.map()

The map() method creates a new array with the results of calling a provided function on every element in this array.
Array ECMAScript5 JavaScript Method polyfill Prototype

Array.prototype.reduceRight()

The reduceRight() method applies a function against an accumulator and each value of the array (from right-to-left) has to reduce it to a single value.
Array ECMAScript5 JavaScript Method polyfill Prototype

Array.prototype.some()

The some() method tests whether some element in the array passes the test implemented by the provided function.
Array ECMAScript5 JavaScript Method Prototype Reference

Array.prototype.values()

The values() method returns a new Array Iterator object that contains the values for each index in the array.
Array ECMAScript6 Iterator JavaScript Method Prototype