keyFinder.js

operatorToFromSDL: (function () {
    // create hash of values once
    var obj = {
        'equal to': 'equals',
        'not equal to': 'not equals',
        'starts with': 'startswith',
        'does not start with': 'not startswith',
        'ends with': 'endswith',
        'does not end with': 'not endswith',
        'does not contain': 'not contains',
        'equals': 'equal to',
        'not equals': 'not equal to',
        'startswith': 'starts with',
        'not startswith': 'does not start with',
        'endswith': 'ends with',
        'not endswith': 'does not end with',
        'contains': 'contains',
        'not contains': 'does not contain'
    };
    
    // return this function. This will be run each time operatorToFromSDL is called
    return key => (typeof key === 'string' && obj[key.trim().toLowerCase()]) || false;
}())