Determine whether an array contains a value [duplicate]

Answer 1

If you have access to ECMA 5 you can use the some method.

MDN SOME Method Link

arrValues = ["Sam","Great", "Sample", "High"];

function namePresent(name){
  return name === this.toString();
}
// Note:
// namePresent requires .toString() method to coerce primitive value
// i.e. String {0: "S", 1: "a", 2: "m", length: 3, [[PrimitiveValue]]: "Sam"}
// into
// "Sam"

arrValues.some(namePresent, 'Sam');
=> true;

If you have access to ECMA 6 you can use the includes method.

MDN INCLUDES Method Link

arrValues = ["Sam","Great", "Sample", "High"];

arrValues.includes('Sam');
=> true;