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array contains case insensitive javascript

var array = ['I', 'hAve', 'theSe', 'ITEMs'],
    query = 'these',
    result = array.findIndex(item => query.toLowerCase() === item.toLowerCase());

console.log(result); // 2
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javascript array find case insensitive

array.filter(s => s.toLowerCase().includes(str.toLowerCase()))
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